NCERT Solutions for Ganita Prakash Chapter 2 Lines and Angles
Updated on 2026-09-05
About this chapter
A point shows an exact location. A line segment is the shortest path between two points, a line is a segment stretched endlessly both ways, and a ray starts at one point and goes on endlessly in one direction. Through one point you can draw endlessly many lines, but through two points only one line can be drawn. An angle is made by two rays with a common starting point. The common point is the vertex and the two rays are the arms . In ∠DBE the vertex is always the middle letter. The size of an angle is the amount of turn from one arm to the other — it does not depend on how long the arms are drawn. A full turn is divided into 360 equal parts ; each part is 1 degree (1°). So a straight angle is 180° and a right angle is 90°. Angles are named by their measure: acute (less than 90°), right (9
- Sections 2.2 & 2.3 Line Segment and Line
- – 17Section 2.4 Ray
- Angle
- – 21Section 2.5 Angle
- Comparing Angles
- – 27Sections 2.6 & 2.7 Comparing Angles, Rotating Arms
- – 31Section 2.8 Special Types of Angles
- – 31Section 2.8 Right Angles and Perpendicular Lines
- Classifying Angles
- Measuring Angles
Exercises
- Sections 2.2 & 2.3 Line Segment and Line — In-text Questions Page 14 & 15
- – 17Section 2.4 Ray — Figure it Out Page 15
- In-text Questions — Angle Page 17 & 18
- – 21Section 2.5 Angle — Figure it Out Page 19
- In-text Questions — Comparing Angles Page 21 & 23
- Figure it Out — Comparing Angles Page 23
- – 27Sections 2.6 & 2.7 Comparing Angles, Rotating Arms — In-text Questions Page 24
- – 31Section 2.8 Special Types of Angles — In-text Questions Page 28
- – 31Section 2.8 Right Angles and Perpendicular Lines — Figure it Out Page 29
- Figure it Out — Classifying Angles Page 31 & 32
- In-text Questions — Measuring Angles Page 34
- Figure it Out — The Unlabelled Protractor Page 35
- In-text Questions — The Labelled Protractor Page 36 & 37
- – 40Section 2.9 Make your own Protractor — In-text Questions Page 38
- – 43Section 2.9 Measuring Angles with a Protractor — Figure it Out Page 40
- Mind the Mistake, Mend the Mistake! — In-text Questions Page 44
- Figure it Out — Where are the Angles? Page 45 & 46
- Figure it Out — Drawing Angles Page 49 & 50
- Figure it Out — Types of Angles and their Measures Page 51 & 52
- Let's Explore — In-text Questions Page 53
- Figure it Out — Types of Angles and their Measures Page 53 & 54