Perimeter of Rectangle

Description

A rectangle is any quadrilateral with four right angles. A convex quadrilateral is a rectangle if and only if it is any one of the following:
an equiangular quadrilateral
a quadrilateral with four right angles
a parallelogram with at least one right angle
a parallelogram with diagonals of equal length. A perimeter of a rectangle is a path that surrounds it in two dimensions. The perimeter of a rectangle can be calculated by the length of its sides.