## Dictionary Definition

The Oxford English Dictionary defines a rectangle as "a plane figure with four straight sides and four right angles, opposite sides being parallel and equal in length; especially one in which adjacent sides are unequal, as contrasted with a square."## Properties of Rectangles

- Opposite sides of a rectangle are of equal length.

- All angles in a rectangle are right angles.

- Opposite sides of a rectangle are parallel.

- All angles of a rectangle add up to 360°.

- The diagonals of a rectangle are equal in length. They bisect each other. They cross each other half-way along their lengths.

## The Perimeter of a Rectangle

The perimeter of a rectangle is given by the formula:In this formula,

**b**is the length of the base and

**h**is the height of the rectangle.

## The Area of a Rectangle

The area of a rectangle is given by the formula:In this formula,

**b**is the length of the base and

**h**is the height of the rectangle.

how to find the area of a rectangle

## Interactive Widget

Here is an interactive widget to help you learn about rectangles.## A Rectangle is a Polygon

A rectangle is a type of polygon. A polygon is a 2-dimensional shape with straight sides. A rectangle is an irregular polygon. It has different length sides.## A Rectangle Is a Quadrilateral

A rectangle is a quadrilateral. A rectangle is a four-sided polygon. Parallelograms, squares and trapezoids are also quadrilaterals.## You might also like...

#### Help Us Improve Mathematics Monster

- Do you disagree with something on this page?
- Did you spot a typo?

__this form__.

#### Find Us Quicker!

- When using a search engine (e.g., Google, Bing), you will find Mathematics Monster quicker if you add
**#mm**to your search term.

#### Share This Page

If you like Mathematics Monster (or this page in particular), please link to it or share it with others.

If you do, __please tell us__. It helps us a lot!

#### Create a QR Code

Use our handy widget to create a QR code for this page...or any page.