## The Lesson

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.