QRST is a rectangular piece of paper. Corners S and T are folded upwards as shown. ∠SVW = 18° and ∠TVE = 11 °
- Find ∠SWV
- Find ∠TVS
(a)
∠SWV
= 180° - 90° - 18°
= 72° (Angles sum of triangle)
(b)
∠TVS
= 180° - 11° - 11° - 18° - 18°
= 122° (Angles on a straight line)
Answer(s): (a) 72° (b) 122°