Question

How do i prove a quadrilateral is a square, i proved it was a parallelogram, and a rectangle now what?

Answer 1

Well you can prove that a square is a quadrilateral, but not all quadrilaterals are squares, so you can't really prove that unless you're proving that a *given* quadrilateral is a square.

Answer 2

prove adjacent sides are equal

Answer 3

square----> all sides are equal and all angles are 90
parallelogram---> opposite sides are parallel
rectangle----> all angles are 90