Question

Prove that the opposite angles of a parallelogram are congruent.

Answer 1

@Mertsj @apoorvk

Answer 2

@ParthKohli

Answer 3

That's a property of parallelograms, so you should be able to just state it. But if you have to prove it, I say you draw a diagonal from one angle to the opposite one, and then prove that the two triangles formed are congruent, since their three sides have the same lenght. After that, just prove that the opposite angles are congruent because correspondent angles on congruent triangles are congruent.

Good Luck! :)