CDEF is a rhombus. CFG is an equilateral triangle. Find
- ∠GCD
- ∠CDF
(a)
∠GCF
= 180° ÷ 3
= 60° (Equilateral triangle)
∠DCF = ∠DEF = 108° (Rhombus)
∠GCD
= 108° + 60°
= 168°
(b)
∠CDF
= (180° - 108°) ÷ 2
= 36° (Isosceles triangle)
Answer(s): (a) 168°; (b) 36°