14. Draw clock faces with times to represent: a) 1
– 4 of a full rotation
b) b) 1
– 2 of a full rotation
c)
c) 3
– 4 of a full rotation
15. Decide whether each of the following angles are nearer to 90°or 180°. a)
d)
16. Estimate how many degrees are in each of these angles. a)
b) c)
d)
17. When would we need to get exact measurements of angles? Think of 3 examples. When we want to measure angles, we use a protractor.
It has a baseline with a centre point and 2 marked scales from 0° to 180°.
Examine your protractor and discuss why it has 2 scales: 1 starting from the right of the protractor and 1 starting from the left.
When measuring an angle, remember to place the baseline of the protractor along 1 of the lines of the angle and the point of the angle on the centre point of the protractor.