Hello, cedricc!

Prove that if the diagonals of a cyclic quadrilateral are equal ,

then so is a pair of opposite sides.Code:* * * * * A o---------------o B * * *|* * * | * * * | * * * * | * * ** | * * * | * * * |* * * o C * * * o * * D

Draw and

We have cyclic quadrilateral