The figure shows a parallelogram. Find
- ∠t
- ∠s
- ∠r
(a)
∠WZX
= 180° - 30° - 72°
= 78° (Angles sum of triangle)
∠t = ∠WZX = 78° (Vertically opposite angles)
(b)
∠s = ∠WVX = 60° (Alternate angles)
(c)
∠XZW = ∠t = 78° (Vertically opposite angles)
∠r
= 78° - 60°
= 18° (Exterior angle of a triangle)
Answer(s): (a) 78°; (b) 60°; (c) 18°
