Question

ABCE is a parallelogram with AE//BC; AB//EC and AE = BC ; AB = EC.

Č = 90° . Calculate with reasons the size of Â1 , Â2 , Č2 and Č3.​

Answer 1

Â1 = 16° ( interior angles of a triangle = 180° )

Â2 = 90° ( alternating angles; AE // BC )

Â1 = Č2 = 16° ( alternating angles; AB // EC )

Č3 = 74° ( angles on a straight line = 180° )