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Rectangle

In Euclidean plane geometry, a **rectangle** is any quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°). It can also be defined as a parallelogram containing a right angle. A rectangle with four sides of equal length is a square. The term is occasionally used to refer to a non-square rectangle. A rectangle with vertices *ABCD* would be denoted as .

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