Page 101 - Start Up Mathematics_6

EXERCISE 5.2

1. In the following pair of angles, say which angle is greater without measuring it. Which
method have you applied? A P

O B Q R

2. Draw a triangle ABC. Measure its angles using a protractor and find their sum.
3. Draw ∠AOB and take a ray OC in such a way that ray OC lies between rays OA and OB.
Now using a protractor verify that ∠AOB = ∠AOC + ∠COB.

4. Which direction will you face if you start facing north and make
1 1
(a) of a revolution clockwise? (b) of a revolution clockwise? (c) one revolution?
4 2
5. Where will the hand of a clock stop if it starts at

(a) 3 and makes one-half of a revolution clockwise?
(b) 12 and makes one-quarter of a revolution clockwise?

(c) 6 and makes three-quarters of a revolution clockwise?
6. Find the measure of the angle between the hands of the clock in each figure:

(a) (b) (c)

7. Classify the following angles as acute, obtuse, right, straight, reflex or zero angle.
110° 35° 0° 67.5° 270° 180° 90° 350° 89.5° 135°

8. A car moves towards east. If on a round about it turns towards north, through what angle
does it turn?
9. A bicycle wheel takes three and a half turns. Find the number of right angles through
which it turns.
10. On a clock face, through how many right angles does the minute hand move between
9:00 a.m. to 11:30 a.m.?

11. Find the measure of the angle shown in each figure. First estimate through observation
and then find the actual measure with the help of a protractor.

(a) (b)

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