# What Is a Rectangle?

## What Is a Rectangle?

A rectangle is a four sided shape with four right angles. ### 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.

Read more about how to find the area of a rectangle

What is a right angle? What is an angle? Finding the area of a rectangle What is a polygon? Learn about rectangles ( interactive widget)