In the figure, CDE and EFG are isosceles triangles where CE = DE and EF = EG. Given that FH, GK and CM are straight lines, find
- ∠JNM
- ∠GHN
(a)
∠CDE = ∠DCE = ∠EFG = ∠EGF (Isosceles triangle)
∠EGF = ∠HGN = 42° (Verticallly opposite angles)
∠KGN
= 42° - 16°
= 26°
∠GJN
= 180° - 103°
= 77° (Angles on a straight line)
∠JNM
= 77° + 26°
= 103° (Exterior angle of a triangle)
(b)
∠GHN
= 103° - 42°
= 61° (Exterior angle of a triangle)
Answer(s): (a) 103°; (b) 61°