Math Wiki

In geometry, a rectangle is defined as a quadrilateral where all four of its angles are right angles. A rectangle with vertices ABCD would be denoted as .

Rectangles hold the following properties:

  • Opposite sides are of equal length (congruent)
  • Adjacent sides meet at right angles
    • All four angles are of equal measure (congruent)
    • All four angles are right angles
      • Adjacent angles are supplementary
    • Opposite sides are parallel
  • Diagonals are of equal measure (congruent)
    • Diagonals bisect one another


The area of a rectangle is computed as the product of its length and its width:


The perimeter of a rectangle is computed as:


The circumradius of a rectangle is:


The inradius of a rectangle is:

Diangle length

The diangle length of a rectangle is: