The figure is made up of straight lines. Given that ∠a is four times that of ∠c, find
- ∠a
- ∠b
- ∠c
(a)
∠a = 84° (Vertically opposite angles)
(b)
∠b
= 180° - 84° - 21°
= 75° (Angles on a straight line)
(c)
∠c
= 84° ÷ 4
= 21°
Answer(s):(a) 84°; (b) 75°; (c) 21°