Question

Can a quadrilateral ABCD be a parallelogram if (1 ) angle A + angle C = 180

Answer 1

yes due to cyclic
quadrilateral theorem each and either pair of opposite angels sum is 180 hence prove hope it helps you

Answer 2

Yes. It can be a quadrilateral, but a cyclic quadrilateral. But it cannot be a separate polygon.
If angle A = angle B, then it can be a separate quadrilateral.

This is my answer. Hope it helps!

If it did help, please mark my answer as brainliest