# Rectangle A **rectangle** is a [[quadrilateral]] in which all interior angles are [[right angles]]. ## Useful Properties * Opposite sides of a rectangle are the same length. * The diagonals are the same length as each other. * If the diagonals meet at [[right angles]] then the rectangle is a square. * The [[symmetry group|symmetries]] of a rectangle are: * two [[rotational symmetry|rotations]] * two [[reflectional symmetry|reflections]] ## Area of a Rectangle The [[area]] of a rectangle can be found by multiplying its _width_ by its _height_, where the _width_ and _height_ are the lengths of any two [[perpendicular]] sides. [[!redirects rectangles]] [[!redirects area of a rectangle]]