A rhombus is a quadrilateral that has four congruent sides. Prove the following theorems about…

A rhombus is a quadrilateral that has four congruent sides. Prove the following theorems about rhombi. (a) Every rhombus is convex. (b) The diagonals of a rhombus intersect at a point that is the midpoint of each diagonal. (c) The diagonals of a rhombus are perpendicular. (d) Every rhombus is a parallelogram.