An equilateral triangle, DEF, is folded as shown in the figure. Find
- ∠TSF
- ∠ETF.
(a)
∠SFT = 60° (Equilateral triangle DEF)
∠TSF
= 180° - 60° - 54° (Angles sum of triangle)
= 66°
(b)
∠ETF
= 180° - 54° - 54°
= 72° (Angles on a straight line)
Answer(s): (a) 66°; (b) 72°