Rectangle

A rectangle is a quadrilateral with four right angles

Specifications

• A parallelogram with at least one right angle
• A parallelogram with diagonals of equal length
• A parallelogram ABCD where triangles ABD and DCA are congruent
• An equiangular quadrilateral
• A quadrilateral with four right angles
• A quadrilateral where the two diagonals are equal in length and bisect each other

Facts

Perimeter:
P = 2\ell + 2w = 2(\ell + w)

Area:
A = \ell w