Page 156 - Math Skill - 5

154 Maths

Exercise 12.2

1. Using protractor and ruler, draw the following angles.
(a) 75° (b) 137° (c) 175° (d) 20°
2. Which of the following pairs of angles are complementary?

(a) 60°, 120° (b) 38°, 52° (c) 63°, 28° (d) 90°, 0°

3. Which of the following pairs of angles are supplementary?
(a) 112°, 68° (b) 33°, 147° (c) 19°, 163° (d) 45°, 90°
4. Write the complement of each of the following angles.

(a) 90° (b) 62° (c) 13° (d) 47° (e) 38° (f) 81°
5. Write the supplement of each of the following angles.

(a) 137° (b) 18° (c) 179° (d) 103° (e) 83° (f) 111°

Types of Lines Challenge

A line can be of different types. I’m long and straight,
Coplanar Lines never bending or round,
In geometry class,
The lines which lie in the same B I’m known for endless straight track.
plane are called coplanar lines. A
Drawn with a ruler, I’m easy to see,
In the figure, AB and CD are C D What am I?

coplanar lines. Can you tell my name?

Intersecting Lines
R
The lines which cross each other are called intersecting lines. In the figure,
Q
O PQ and RS are intersecting lines which intersect each other at the point

P
S ‘O’. Two lines can intersect at one and only one point.

Perpendicular lines E

When two lines intersect and make an angle of 90°, we say that the given lines 90°

are perpendicular to each other. In the given figure, EF is perpendicular to G H

GH. It is represented as EF ⊥ GH. F
Parallel lines

A B The lines which lie in the same plane and do not intersect are known as

parallel lines. In the figure, AB is parallel to PQ and it is represented as
P Q
AB PQ . The distance between two parallel lines always remains constant.