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A rectangle is a polygon of four sides where every angle is a right angle (90°).[1]


As a result of this definition:

  • Each pair of opposite sides is of equal length.
  • Opposite sides are parallel
  • Diagonals are equal
  • Adjacent sides are perpendicular
  • Area = product of any two adjacent sides

Please note that the adjacent sides may or may not be of equal length. The special case where all four sides of a rectangle are equal is called a square, which is also a rhombus and a kite.


  1. There are many definitions of rectangle, but it seems sensible to use one which is based on angle properties rather than length or parallelism properties. Definition adapted from