18. Name these angles. Estimate the size of each and then check your estimate by measuring them with your protractor.
a)
b)
c)
d)
e)
f)
g)
h)
19. Have a go at drawing these angles using only your ruler and pencil. When fi nished, check how accurate you are by measuring the angle with your protractor and write down the difference.
a) 20° e) 100°
b) 170° f) 10°
b) 120° f) 140° j) 30°
c) 90° g) 135°
20. Draw these angles using a pencil, ruler and protractor. a) 80° e) 60° i) 180°
c) 95° g) 15° k) 110°
d) 45° h) 70°
d) 5°
h) 165° l) 22°
When drawing angles, remember: Draw 1 line of the angle with a ruler. Place the baseline of the protractor on this line, with the centre point on the end of the line.
Follow the scale to the angle you want and mark this point. Join this point to the end of your line.