Question

Prove that the opposite angles of a parallelogram are congruent.

Answer 1

Can anyone help?

Answer 2

Well, that's a property of parallelograms.

Answer 3

But if you must 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 length.

Answer 4

After that, just prove that the opposite angles are congruent because correspondent angles on congruent triangles are congruent..
@BIGDOG96