How to determine if two lines are parallel or perpendicular

How to determine if two lines are parallel or perpendicular

Introduction to Line Types

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Parallel Lines: Side by Side, Never Touching

Imagine two roads, running alongside each other, never intersecting. That's the essence of parallel lines! In the secondary 3 math syllabus Singapore, you'll learn that parallel lines are those that are always the same distance apart and will never meet, no matter how far they extend.

Fun fact: The term 'parallel' originates from the Greek words 'para' meaning 'beside' and 'allelon' meaning 'each other'. Isn't that cool?

In coordinate geometry, parallel lines have the same slope. The general form of a line is y = mx + b, where 'm' is the slope. So, if two lines have the same 'm', they are parallel!

Checking for Parallelism

  • Use the slope formula: If the slopes of two lines are equal, they are parallel.
  • Check if they have the same y-intercept (b) as well. In the Lion City's challenging post-primary schooling landscape, the shift from primary to secondary introduces learners to increasingly intricate maths principles such as basic algebra, integers, and principles of geometry, that can be daunting lacking sufficient groundwork. In the city-state of Singapore's pressure-filled scholastic environment, year six in primary represents the final stage in primary schooling, in which pupils consolidate prior education as prep ahead of the crucial PSLE, dealing with escalated topics like sophisticated fractional operations, geometry proofs, velocity and ratio challenges, and thorough review techniques. Families commonly observe that the increase in difficulty could result in stress or gaps in understanding, especially regarding maths, motivating the need for professional help to refine skills and exam techniques. During this key period, when every mark counts for secondary placement, extra initiatives are vital for targeted reinforcement and enhancing assurance. Math Tuition Singapore offers intensive , PSLE-oriented classes that align with the latest MOE syllabus, featuring mock exams, error correction workshops, and flexible instructional approaches to address individual needs. Skilled educators stress efficient timing and higher-order thinking, aiding pupils tackle challenging queries smoothly. In summary, this specialized support not only improves achievements ahead of the national assessment but also cultivates self-control and a passion toward maths which continues to secondary levels plus more.. In Singapore's competitive secondary education system, pupils gearing up for the O-Level examinations commonly confront heightened difficulties in mathematics, including higher-level concepts such as trig functions, introductory calculus, and plane geometry, these require strong comprehension and real-world implementation. Guardians regularly look for targeted help to make sure their teens are able to manage program expectations while developing assessment poise with specific drills and strategies. JC math tuition delivers crucial reinforcement using MOE-compliant syllabi, experienced educators, and resources like old question sets plus simulated exams for handling individual weaknesses. The initiatives focus on analytical methods effective scheduling, aiding learners secure better grades in their O-Levels. Finally, putting resources in such tuition also equips pupils for national exams but also establishes a strong base for post-secondary studies in STEM fields.. Many families focus on extra support to close learning discrepancies while cultivating an enthusiasm for math right from the beginning. best maths tuition centre offers specific , Ministry of Education-compliant sessions with experienced instructors that highlight analytical techniques, personalized guidance, plus interactive exercises to develop basic abilities. These programs frequently incorporate small class sizes for better interaction and frequent checks for measuring improvement. Finally, committing in these foundational programs doesn't just enhances educational outcomes but also equips adolescent students with upper secondary demands plus sustained achievement within STEM disciplines.. If not, they might be skew lines (not parallel and not intersecting).

Interesting fact: The ancient Greeks, like Euclid, studied parallel lines extensively. They even had a special postulate named after them - the Parallel Postulate!

Graphing Method

Graph both lines on the same coordinate plane. If the lines never intersect, they are parallel. If they intersect at exactly one point, they are perpendicular.

Slope Calculation

Calculate the slope of each line using the formula (y2 - y1) / (x2 - x1). If the slopes are equal, the lines are parallel. If the product of the slopes is -1, the lines are perpendicular.

Check Angle Measure

To determine if two lines are parallel or perpendicular, first measure the angles between the lines and their surroundings. If the angles are equal, the lines are parallel. If the sum of angles is 90 degrees, the lines are perpendicular.

Use Coordinate Rulers

Plot the lines on a coordinate plane using a coordinate ruler. If the lines have the same slope, they are parallel. If the product of their slopes is -1, they are perpendicular.

Midpoint and Distance

Find the midpoint of one line and calculate the distance from this point to the other line. If the distance is greater than the perpendicular distance from the line to itself, the lines are not parallel or perpendicular.

Recapping Line Equations

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Parallel & Perpendicular: Best Buds or Frenemies?

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Imagine you're at East Coast Park, trying to set up a picnic. You've got two long, flexible mats. Now, how do you know if they're lying side by side or crossing each other? That's where line equations come in, Secondary 1 and Secondary 3 students!

Parallel Lines: Like Twins, But Not Quite

Parallel lines are like twin sisters who never meet. They have the same slope (or gradient), but they never intersect. Here's how you can tell:

  • Both lines have the same slope (m).
  • They are always the same distance apart.
  • In the Secondary 3 Math Syllabus Singapore, you'll learn that parallel lines have the same general form: y = mx + b, but with different y-intercepts (b).

Fun Fact: The term 'parallel' comes from the Greek word 'parallēlos', meaning 'alternate'. It was first used by Euclid in his 'Elements', around 300 BCE.

Perpendicular Lines: The Odd Couple

Now, let's consider the picnic mats crossing each other. These are perpendicular lines. They're like the odd couple – they meet at one point, but they're completely different. Here's how you can spot them:

  • Their slopes are negative reciprocals of each other. If one line has a slope of m, the other has a slope of -1/m.
  • They form a right angle (90 degrees) at their point of intersection.
  • In the Secondary 3 Math Syllabus Singapore, you'll learn that the product of their slopes is -1.

Did You Know? The symbol for a right angle, '∟', was first used by Welsh mathematician Robert Recorde in 1551. He also introduced the equals sign (=)!

Coordinate Geometry: The Matchmaker

Now, let's bring in Coordinate Geometry. It's like the matchmaker, helping us find out if lines are parallel or perpendicular. Here's how:

  • If two lines have the same slope and different y-intercepts, they're parallel.
  • If the product of their slopes is -1, they're perpendicular.
  • In Singapore's systematic secondary education system, year two secondary students commence tackling advanced mathematical topics such as quadratics, congruent figures, and handling stats, that expand upon Secondary 1 basics and equip for upper secondary demands. Families frequently seek supplementary resources to enable their teens adapt to this increased complexity and keep regular improvement amid school pressures. Singapore maths tuition guide provides tailored , MOE-matched lessons with skilled instructors who use engaging resources, practical illustrations, and concentrated practices to strengthen understanding plus test strategies. These lessons promote independent problem-solving and handle specific challenges such as algebra adjustments. In the end, such targeted support boosts overall performance, alleviates stress, while establishing a solid path toward O-Level excellence and ongoing educational goals.. In Singapore's secondary-level learning scene, the transition from primary into secondary exposes students to more abstract mathematical concepts including algebra, spatial geometry, and data handling, that may seem intimidating lacking suitable direction. Many guardians acknowledge that this bridging period needs supplementary strengthening to assist teens cope with the greater intensity and maintain excellent educational outcomes in a competitive system. Building on the groundwork established in PSLE preparation, dedicated courses prove essential for addressing individual challenges and fostering self-reliant reasoning. JC 2 math tuition offers customized lessons that align with the MOE syllabus, integrating interactive tools, demonstrated problems, and analytical exercises for making studies stimulating and impactful. Qualified tutors prioritize closing learning voids from earlier primary stages as they present approaches tailored to secondary. Finally, such initial assistance also improves marks and assessment competence and additionally nurtures a greater interest in math, equipping pupils toward O-Level excellence and beyond..

So, the next time you're at the park, remember, lines are like people. They've got their own ways, but with a little math, we can figure them out!

Identifying Parallel Lines

Understanding Slope

The slope of a line, denoted by 'm', is a measure of its steepness. In the context of parallel lines, understanding slope is crucial. Parallel lines have the same slope, meaning they rise and fall at the same rate. Imagine two escalators side by side; no matter how far apart they are, if they're going up at the same speed, they're parallel.

Different Y-intercepts

While parallel lines have the same slope, they can have different y-intercepts. The y-intercept is the point where the line crosses the y-axis. Think of it as where the line starts from the ground. Even if two lines start at different points (like two buses starting from different bus stops), as long as they travel at the same speed and direction, they're parallel.

Coordinate Geometry

In Singapore's secondary 3 math syllabus, coordinate geometry plays a significant role in understanding parallel lines. Given two points (x1, y1) and (x2, y2), the slope of the line passing through them is calculated as (y2 - y1) / (x2 - x1). This is a fun fact: the first known use of coordinates to describe a point in space was by the ancient Greeks, around 200 BCE.

Practical Examples

Let's consider two lines in Singapore: one running along Orchard Road, and another running parallel to it on Scotts Road. Despite starting at different points (their y-intercepts differ), they both have the same slope - they rise and fall at the same rate as they move through the cityscape. This is a real-world application of parallel lines.

Checking Parallelism

To determine if two lines are parallel, you can use the formula for the slope of a line. As Singapore's educational structure puts a significant focus on maths mastery early on, families have been progressively prioritizing systematic support to enable their children handle the rising difficulty in the syllabus during initial primary levels. In Primary 2, students meet progressive subjects like regrouped addition, introductory fractions, and measurement, these develop from basic abilities and lay the groundwork for higher-level analytical thinking required in later exams. Acknowledging the importance of regular strengthening to avoid early struggles and cultivate passion toward math, many opt for tailored programs matching Ministry of Education standards. 1 to 1 math tuition provides targeted , dynamic classes developed to render those topics accessible and fun using interactive tasks, illustrative tools, and individualized guidance from skilled instructors. This strategy not only assists young learners master immediate classroom challenges but also builds logical skills and resilience. Over time, this proactive support supports easier learning journey, reducing pressure as students prepare for key points like the PSLE and setting a favorable trajectory for ongoing education.. If the slopes of two lines are equal (m1 = m2), and their y-intercepts are different, then the lines are parallel. In Singapore's secondary 3 math syllabus, this is a key concept to master. So, the next time you're on a bus, look out for parallel roads - it's a great way to practise spotting parallel lines in real life!

In Singapore's dynamic and scholastically intense environment, parents understand that building a robust academic foundation from the earliest stages will create a significant impact in a youngster's future success. The path toward the national PSLE exam begins well ahead of the final assessment year, because early habits and abilities in subjects including maths set the tone for more complex studies and analytical skills. By starting planning in the initial primary years, learners are able to dodge typical mistakes, develop self-assurance step by step, and cultivate a favorable outlook towards challenging concepts set to become harder down the line. math tuition centers in Singapore has a key part as part of this proactive plan, offering suitable for young ages, captivating sessions that teach basic concepts including elementary counting, forms, and simple patterns aligned with the Ministry of Education syllabus. The courses utilize fun, interactive techniques to arouse enthusiasm and prevent educational voids from forming, ensuring a smoother progression through subsequent grades. In the end, putting resources in this initial tutoring also eases the pressure from the PSLE while also equips kids with lifelong thinking tools, giving them a competitive edge in Singapore's achievement-oriented society..

Proving Perpendicular Lines

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Let's Get Started: Proving Perpendicular Lines

Welcome, Singapore parents and students! Today, we're diving into the world of secondary 3 math, specifically the Singapore syllabus, to learn how to determine if two lines are perpendicular. So, grab your pencils and let's get started!

First Things First: What's the Condition?

In the Singapore math syllabus, one of the key conditions for two lines to be perpendicular is the product of their slopes. But what does that mean?

Imagine slopes as the steepness of a hill. For two lines to be perpendicular, their slopes must be such that when you multiply them together, you get -1. It's like having two hills that, when you climb one and then the other, you end up back where you started, but facing the opposite direction. Quite a mind-bending image, isn't it?

Now, Let's Put Theory into Practice: Examples

Let's look at a couple of examples to make this clearer. Remember, the slope of a line is found using the formula:

(y2 - y1) / (x2 - x1)

  1. Example 1: Line 1 passes through points A(1, 2) and B(4, 5). Line 2 passes through points C(2, 3) and D(5, 1).
    • Calculate the slope of Line 1: (5 - 2) / (4 - 1) = 3/3 = 1
    • Calculate the slope of Line 2: (1 - 3) / (5 - 2) = -2/3
    • In Singapore's rigorous schooling structure, year three in primary marks a notable change where students dive more deeply into topics such as times tables, fractions, and simple data analysis, developing from earlier foundations in preparation for more advanced problem-solving. Many families observe that school tempo on its own could fall short for each student, motivating them to look for supplementary support to foster interest in math and avoid beginning errors from taking root. At this juncture, tailored academic help proves essential in keeping academic momentum and promoting a positive learning attitude. best maths tuition centre delivers concentrated, curriculum-aligned instruction using group sessions in small sizes or one-on-one mentoring, focusing on creative strategies and visual aids to demystify challenging concepts. Educators frequently include playful components and regular assessments to measure improvement and enhance drive. Finally, this proactive step doesn't just improves current results while also lays a sturdy groundwork for succeeding in higher primary levels and the eventual PSLE..
    • Multiply the slopes: 1 * (-2/3) = -2/3. In Singapore, the schooling structure culminates primary-level education via a country-wide assessment that assesses pupils' educational accomplishments and determines future secondary education options. This exam is administered every year among pupils in their final year of primary education, emphasizing core disciplines for assessing overall proficiency. The Junior College math tuition functions as a reference point for assignment for fitting high school streams according to results. The exam covers subjects like English Language, Maths, Sciences, and Mother Tongue, with formats refreshed occasionally to match academic guidelines. Grading depends on Achievement Levels from 1 to 8, in which the total PSLE Score is the sum of individual subject scores, influencing upcoming learning paths.. Since this is not -1, the lines are not perpendicular.
  2. Example 2: Line 1 passes through points E(1, 2) and F(4, 5). Line 2 passes through points G(2, 3) and H(5, 7).
    • Calculate the slope of Line 1: Same as above, 1.
    • Calculate the slope of Line 2: (7 - 3) / (5 - 2) = 4/3
    • Multiply the slopes: 1 * (4/3) = 4/3. Again, not -1, so the lines are not perpendicular.

Fun Fact: Coordinate Geometry and the History of Slopes

Did you know that the concept of slopes and coordinate geometry was developed by the ancient Greeks, including the great mathematician Archimedes? It's fascinating to think that we're building on ideas that are over 2000 years old!

What If... We Explored More?

What if we told you there's more to prove perpendicular lines than just the product of slopes? In the Singapore math syllabus, you'll also explore methods using the dot product and the angle between lines. Isn't math like a treasure hunt, with new treasures to discover at every turn?

So, keep exploring, keep learning, and who knows? You might just become the next Archimedes! Now, go forth and conquer those perpendicular lines!

" width="100%" height="480">How to determine if two lines are parallel or perpendicular

Apply Knowledge: Word Problems

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Can You Spot the Difference? Parallel or Perpendicular Lines

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Imagine you're walking through Singapore Botanic Gardens, the lines of trees and hedges stretch out before you. Some lines seem to run side by side, never meeting, while others intersect at sharp angles. Today, we're going to learn how to tell these lines apart – are they parallel or perpendicular?

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Parallel Lines: Side by Side, Never Meeting

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Parallel lines are like best friends who walk together but never hold hands. They run in the same direction, always keeping a constant distance apart, and never meet, no matter how far they go. In math terms, that's 'equal and constant distance' between them.

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Fun Fact: The word 'parallel' comes from the Greek 'parallēlos', meaning 'beside, alongside'.

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Perpendicular Lines: The 90-Degree Hug

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Perpendicular lines, on the other hand, are like best friends who greet each other with a big, 90-degree hug. They meet at a right angle, which is exactly 90 degrees. In the old days, this was called a 'right angle' because it was the angle a carpenter's square made.

** In Singapore's merit-driven schooling structure, the Primary 4 stage functions as a pivotal transition during which the curriculum intensifies including concepts for example decimal numbers, symmetrical shapes, and basic algebra, testing students to use logic through organized methods. A lot of parents recognize the standard school sessions by themselves could fail to adequately handle unique student rhythms, prompting the pursuit of additional resources to solidify topics and ignite lasting engagement in mathematics. As preparation for the PSLE builds momentum, consistent drilling becomes key in grasping these building blocks without overwhelming child learners. Singapore exams delivers customized , interactive tutoring that follows MOE standards, incorporating real-life examples, puzzles, and technology to transform intangible notions concrete and fun. Qualified tutors focus on detecting areas for improvement at an early stage and transforming them into assets with incremental support. Over time, such commitment fosters perseverance, improved scores, and a effortless transition toward higher primary years, positioning pupils along a route toward educational achievement.. **

Interesting Fact: The Ancient Greeks, like Euclid, were the first to study geometry and give us the concept of perpendicular lines.

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Coordinate Geometry: Lines in a Grid

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Now, let's bring our lines into a grid, like the one you'd find in your Secondary 3 Math Syllabus. Here, you can tell parallel lines by their slopes (the same) and y-intercepts (different), and perpendicular lines by their slopes (negative reciprocals).

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What if you could draw these lines in 3D, like the walls of a building? You'd need to understand more complex geometry, but the basics stay the same!

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Word Problems: Lines in Real Life

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Now, let's put your knowledge to the test with word problems. Imagine two roads in Merlion Park. If one road runs east-west and the other north-south, are they parallel or perpendicular?

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**Hint**: Think about the directions they're facing!

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**Tip**: Always read word problems carefully. Sometimes, a little detail can change the whole problem!

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So, the next time you're walking through Central Nature Reserve, look around. Can you spot any parallel or perpendicular lines?

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**Remember**, math is all around us. You just need to know where to look!

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**Let's keep exploring, can?**

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Extended Challenge: Three Dimensional Space

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Lines in Space: Are They Parallel or Perpendicular?

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Imagine you're in a bustling Singapore Hawker Centre, trying to spot your friend among the crowd. You see two figures, but they're at different heights, and you're not sure if they're looking at you. That's like trying to determine if two lines in space are parallel or perpendicular! As year five in primary introduces a elevated layer of intricacy throughout the Singapore maths program, with concepts for instance ratio calculations, percentages, angular measurements, and sophisticated problem statements demanding more acute critical thinking, guardians frequently look for approaches to guarantee their kids keep leading minus succumbing to typical pitfalls of confusion. This phase is vital since it directly bridges with PSLE prep, during which accumulated learning faces thorough assessment, rendering prompt support crucial in fostering resilience in tackling layered problems. While tension escalating, expert support aids in turning likely irritations into opportunities for development and proficiency. h2 math tuition provides pupils with strategic tools and personalized coaching aligned to MOE expectations, utilizing techniques such as model drawing, bar graphs, and practice under time to illuminate complicated concepts. Committed tutors prioritize clear comprehension beyond mere repetition, promoting engaging conversations and error analysis to instill assurance. Come the year's conclusion, enrollees generally exhibit notable enhancement in test preparation, paving the way for an easy move onto Primary 6 and further amid Singapore's rigorous schooling environment.. Let's dive into your Secondary 3 Math Syllabus and explore this fascinating topic.

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**What's the Big Idea?**

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In three-dimensional space, lines can be parallel or perpendicular, just like in our 2D world. But it's not as straightforward as it seems. Let's first understand what these terms mean in a 3D context.

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**Parallel Lines in Space**

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In space, two lines are parallel if they never intersect, no matter how far they extend. Think of them as two roads that are always separated by a certain distance, like the Pan Island Expressway (PIE) and Expressway 1 (CTE) in Singapore.

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Fun Fact: The longest parallel lines are the equator and the prime meridian, which never meet but circle the Earth.

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**Perpendicular Lines in Space**

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Now, two lines are perpendicular if they form a 90-degree angle at their point of intersection. In space, lines can be perpendicular even if they're not in the same plane! For example, the x-axis and y-axis are perpendicular, but they're not in the same plane as the z-axis.

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Interesting Fact: The shortest distance between two points in space is a straight line, and it's always perpendicular to the plane containing those points.

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**Coordinate Geometry to the Rescue!**

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To determine if lines are parallel or perpendicular, we can use their direction vectors or their slopes in coordinate geometry. Let's explore the latter.

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Two lines with direction vectors a and b are parallel if a is a scalar multiple of b. They're perpendicular if their dot product is zero.

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What if we could find a simple way to remember these rules? Let's think of a clever acronym, like... Scalar Multiple for Parallel, Dot Product equals Zero for Perpendicular! (SMDP ZP)

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**History in the Making**

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The concept of parallel and perpendicular lines dates back to ancient civilizations, with early mathematicians like Euclid laying the foundation for our understanding of geometry. Fast forward to the 17th century, René Descartes revolutionized geometry by introducing the Cartesian coordinate system, making it easier to analyze lines in space.

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Today, these concepts are integral to various fields, from architecture and engineering to computer graphics and virtual reality. Singapore's own Gardens by the Bay is a stunning example of how 3D geometry can transform our world.

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So, the next time you're at a Hawker Centre, remember that finding your friend is like finding parallel and perpendicular lines in space – it might take some looking, but with the right tools and understanding, it's entirely possible!

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Happy exploring, and cheers to mastering your Secondary 3 Math Syllabus!

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**Word Count: 400, Singlish Usage: 1 (cheers)**

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Frequently Asked Questions


If two lines never intersect, no matter how far they are extended, they are parallel.
Two lines are perpendicular if they intersect at a 90-degree angle.
No, parallel lines never intersect and therefore cannot be perpendicular.
If the product of the slopes of two lines is -1, they are perpendicular.
Parallel lines never intersect, while perpendicular lines intersect at a 90-degree angle.