In the figure, CDEF is a parallelogram. EH, HJ and CD are straight lines. CFG is an isosceles triangle.
- Find ∠y.
- Find ∠z.
(a)
∠EHC = ∠DCJ = 64° (Corresponding angles, CD//HE)
∠HGC
= 180° - ∠EHC - ∠HCG
= 180° - 64° - 17°
= 99° (Angles sum of triangle)
∠FGC
= 180° - 99°
= 81° (Angles on a straight line)
∠GFC = ∠FGC = 81° (Isosceles triangle)
∠y
= ∠GFC
= 81° (Corresponding angles, DE//CF)
(b)
∠z
= 180° - 81° - 81°
= 18° (Isosceles triangle CFG)
Answer(s): (a) 81°; (b) 18°