The figure is made up of straight lines. Given that ∠b is twice that of ∠d, find
- ∠b
- ∠c
- ∠d
(a)
∠b = 78° (Vertically opposite angles)
(b)
∠c
= 180° - 78° - 39°
= 63° (Angles on a straight line)
(c)
∠d
= 78° ÷ 2
= 39°
Answer(s):(a) 78°; (b) 63°; (c) 39°