Question

Prove that the opposite angles of a parallelogram are congruent.

Answer 1

3 and 4 are complimentary:

3+4 = 180 degrees

4 and 1 are complimentary

4+1 =180 degrees

so 4 + 1 = 4 + 3

so 1 = 3

Answer 2

Thanks can look look at a diff prob just to dub check it.