Question

prove that a cyclic parallelogram is a square​

Answer 1

Answer:

Congruent supplementary angles are right angles, so opposite angles in a cyclic parallelogram are right angles. Thus all four angles are right angles, and it's a rectangle. If ABCD paralelogram is cyclic, then AB and CD are parallel chords of the circle. ... The opposite angles sum is 180 degrees and they should be equal.