Question

Prove if both pairs of opposite angles of a quadrilateral are equal then it is a parallegram

Answer 1

THEOREM: If a quadrilateral is a parallelogram, it has 2 sets of opposite angles congruent. ... THEOREM: If a quadrilateral has diagonals which bisect each other, then it is a parallelogram. * THEOREM: If a quadrilateral has one set of opposite sides which are both congruent and parallel, then it is a parallelogram.