Page 175 - ICSE Math 6

10. Straight ladder should be set close to a 75° angle from the ground for safe use. Which of the
following ladders is safe to use?

Wall Wall

Ladder A Ladder B

Ground

THINK SMART

1. The sum of two acute angles can never be:
(i) an acute angle (ii) a right angle

(iii) an obtuse angle (iv) a straight angle

2. The sum of an acute angle and a right angle lies between:
(i) 0° to 90° (ii) 90° to 180°
(iii) 180° to 270° (iv) 270° to 360°

3. How many right angles make a complete angle?

4. If two complementary angles are equal, find their measure.
5. If A and B are vertically opposite angles and A = 35°, find the supplementary angle of B.
6. Which angle makes the linear pair with the complementary angle of 72°?

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