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