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