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Concept

Rectangle

A rectangle is a parallelogram with four right angles. This means that the opposite sides are parallel and have the same length. The rectangle's longer sides are usually referred to as its length and the shorter sides as its width
Rectangle with length ell, width w, right angles, and congruent opposite sides.

The area of a rectangle is equal to the product of its dimensions. The diagonals of a rectangle are congruent.

Rectangle with four right angles and the two of the diagonals bisect each other

A square is rectangle with four equal side lengths.