Definition: rectangle from Philip's Encyclopedia

Four-sided geometric figure (quadrilateral), the interior angles of which are right angles and each pair of opposite sides is of equal length and is parallel. It is a special case of a parallelogram. A square is a rectangle with all sides of equal length.

Summary Article: rectangle
From The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Quadrilateral (four-sided plane figure) with opposite sides equal and parallel and with each interior angle a right angle (90°). Its area A is the product of the length l and height h; that is, A = l × h. A rectangle with all four sides equal is a square.

A rectangle is a special case of a parallelogram. The diagonals of a rectangle are equal and bisect each other.

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Rectangles: algebraic expressions

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