rectangle
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A rectangle (or oblong) has four sides, with the opposite sides being parallel and of equal length. Its four angles are all right angles. Its diagonals are of equal length.
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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