The figure shows a rectangle BCDE. ∠BEF = 57° and ∠CED = 40°. Find
- ∠CEF
- ∠BCE
(a)
∠CEF
= 57° + 40° - 90°
= 7° (Overlapping angles)
(b)
∠BEC
= 57° - 7°
= 50° (Overlapping angles)
∠BCE
= 180° - 90° - 50°
= 40° (Angles sum of triangle)
Answer(s): (a) 7°; (b) 40°