The figure shows a parallelogram. Find
- ∠c
- ∠b
- ∠a
(a)
∠EHF
= 180° - 43° - 60°
= 77° (Angles sum of triangle)
∠c = ∠EHF = 77° (Vertically opposite angles)
(b)
∠b = ∠EDF = 61° (Alternate angles)
(c)
∠FHE = ∠c = 77° (Vertically opposite angles)
∠a
= 77° - 61°
= 16° (Exterior angle of a triangle)
Answer(s): (a) 77°; (b) 61°; (c) 16°