Class 7 Mathematics — Chapter 5: Parallel and Intersecting Lines

What you'll learn

• ▸Intersecting Lines and Angles
• ▸Linear Pairs of Angles
• ▸Vertically Opposite Angles
• ▸Perpendicular Lines
• ▸Parallel Lines
• ▸Transversals
• ▸Notations for Parallel and Perpendicular Lines

Chapter Summary

--- PAGE 1 --- 5 PARALLEL AND INTERSECTING LINES 0774CH05 5.1 Across the Line Take a piece of square paper and fold it in different ways. Now, on the creases formed by the folds, draw lines using a pencil and a scale. You will notice different lines on the paper. Take any pair of lines and observe their relationship with each other. Do they meet? If they do not meet within the paper, do you think they would meet if they were extended beyond the paper? Fig. 5.1 In this chapter, we will explore the relationship between lines on a plane surface. The table top, your piece of paper, the blackboard, and the bulletin board are all examples of plane surfaces. Let us observe a pair of lines that meet each other. You will notice that they meet at a point. When a pair of lines meet each other at a point on a plane surface, we say that the lines **intersect** each other. Let us observe what happens when two lines intersect. ? How many angles do they form? In Fig. 5.2, where line *l* interse…

Practice Questions from this Chapter

Tap "Get Solution" on any question to ask our AI tutor.

1. Show real-world parallel lines. Get Solution →
2. Explain where intersecting lines are used. Get Solution →
3. Create a game using angles. Get Solution →
4. What is the term for lines on the same plane that meet each other at a single point? Get Solution →
5. What are a pair of lines called if they lie on the same plane and do not meet, no matter how far they are extended? Get Solution →
6. When two lines intersect each other at right angles (90°), what are they called? Get Solution →
7. What is the name for a line that intersects two or more other lines on a plane? Get Solution →
8. What term describes adjacent angles formed by two intersecting lines that combine to form a straight angle (180°)? Get Solution →

Did you know?

• 💡 Ancient Egyptians used ropes to create perfect right angles for building pyramids.
• 💡 Many spider webs are intricate designs made of radiating and concentric lines.
• 💡 A true geometric line has no thickness and goes on forever in both directions.
• 💡 The 360 degrees in a circle comes from ancient Babylonian astronomy.
• 💡 Light travels in perfectly straight lines, unless it passes through different materials.

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