In the figure, not drawn to scale, O is the centre of the semi circle and ODEF is a rhombus. ∠OFG = 35°. Find
- ∠c
- ∠d.
(a)
OF = OG = Radius
∠FOG
= 180° - 35° - 35°
= 110° (Isosceles triangle)
∠c = ∠FOG = 110° (Corresponding angles, DE//OF)
(b)
∠d
= 180° - 110°
= 70° (Interior angles, EF//DO)
Answer(s): (a) 110°; (b) 70°