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In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal. 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 oblong is occasionally used to refer to a non-square rectangle. A rectangle with vertices ABCD would be denoted as ABCD. The word rectangle comes from the Latin rectang
1 A rectangle is most often characterized by its height h, and its width, w. 2  The width and height of a rectangle are usually different. 3  If they are the same, then the rectangle becomes a square. 4  The perimeter, or distance around a rectangle is h+w+h+w or 2h+2w.5  The area enclosed by a rectangle is h &times w or hw. The perimeter, or distance around a rectangle is h+w+h+w or 2h+2w. 2  The area enclosed by a rectangle is h &times w or hw. 3  The distance from one corner of a rectangle to the opposite corner is sometimes called the diagonal and is given by (w 2 +h 2) 1/2.