The figure is not drawn to scale. Find
- ∠a
- ∠b
(a)
∠e
= 180° - 100°
= 80° (Angles on a straight line)
∠d
= 180° - 81° - 80°
= 19° (Angles sum of triangle)
∠d = ∠a (Alternate angles)
(b)
∠c
= 180° - 100°
= 80° (Interior angles)
∠c = ∠b = 80° (Corresponding angles)
Answer(s): (a) 19°; (b) 80°