The figure shows a parallelogram. Find
- ∠c
- ∠b
- ∠a
(a)
∠EHF
= 180° - 30° - 70°
= 80° (Angles sum of triangle)
∠c = ∠EHF = 80° (Vertically opposite angles)
(b)
∠b = ∠EDF = 67° (Alternate angles)
(c)
∠FHE = ∠c = 80° (Vertically opposite angles)
∠a
= 80° - 67°
= 13° (Exterior angle of a triangle)
Answer(s): (a) 80°; (b) 67°; (c) 13°