### Topic Page: Rectangles

**rectangle**from

*Philip's Encyclopedia*

**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.

essays

Rectangles: algebraic expressions

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rectangle

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##### Full text Article rectangle (in Mathematics)

A quadrilateral in which all four angles are right angles, opposite sides are parallel and equal in length, the diagonals are equal in...

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##### Full text Article parallelogram

A quadrilateral (a shape with four sides) with opposite pairs of sides equal in length and parallel, and opposite angles equal. The diagonals of a p