## Rectangles

##### Definition of a rectangle

A **rectangle** is a quadrilateral in which all angles are right angles.

##### Properties of a rectangle

- A rectangle is a parallelogram, so its opposite sides are equal.
- The diagonals of a rectangle are equal and bisect each other.

##### Tests for a rectangle

- A parallelogram with one right angle is a rectangle.
- A quadrilateral whose diagonals are equal and bisect each other is a rectangle.