A rectangle is a closed plane figure with four sides and four right angles. A rectangle with four equal sides is called a square. Refer to the figure below.

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A rectangle in which the ratio of length to width is approximately 8 to 5, or 8:5, is called a "golden rectangle." It is considered very pleasing to the eye.

The face of the Parthenon, a famous building from ancient Greek times (below, left), is a golden rectangle.

The United States flag is also in the shape of a golden rectangle.

Related word rectangular.

See also golden rectangle, parallelogram, polygon, quadrilateral, square.