Chapter 2 · CBSE Class 6 Maths (NCERT Ganita Prakash)

Lines and Angles

Explore points, lines, rays, and angles — the building blocks of geometry.

📐 Chapter 2

Point, line, ray, and angle illustrated Four small diagrams showing a point, a line with arrows on both ends, a ray with an arrow on one end, and an angle formed by two rays Point Line Ray Angle
2.1

Points, Line Segments, Rays, and Lines

A point marks a location. A line segment connects two points with a fixed length. A ray starts at a point and goes on forever in one direction. A line goes on forever in both directions.

1

What is the key difference between a ray and a line segment?

A ray extends infinitely in one direction; a line segment has two fixed endpoints

2

If a torch shines a beam of light, is that beam better modeled as a line, a ray, or a line segment?

A ray — it starts at the torch and extends outward in one direction

2.2

Types of Angles

An angle is formed where two rays meet at a point. Angles are classified by their measure: acute (less than 90°), right (exactly 90°), obtuse (between 90° and 180°), straight (exactly 180°), and reflex (more than 180°).

1

What type of angle is 150°?

Obtuse angle

2

What type of angle is 200°?

Reflex angle

Practice

Exercises

1. What type of angle is exactly 90°?

2. What type of angle is 60°?

3. What type of angle is exactly 180°?

4. What type of angle is 300°?

5. An open door usually forms which type of angle with the wall?

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