Question

Part of a proof is shown below.

a) Fill in the gaps in the proof by choosing from the options in the boxes. You may use each option more than once.
b) What property of parallelograms have you proved?

Answer 1

Explanation:

a.)

a = d because alternate angles are equal.

b = c because alternate angles are equal.

Therefore a + b = d + c

b.) Opposite angles of a parallelogram are equal.