# Area of Rectangle Formula ## Formula

### Summary

The area of a rectangle is given by the width multiplied by the height.

Expression Description
The area of the rectangle.
The width of the rectangle.
The height of the rectangle.

## Usage

The Area of a rectangle is given by its width multiplied by its height. For example, the area of a rectangle with a width of three units and a height of four units is equal to twelve units squared.

## Examples

### Example 1 This example shows how to calculate the area of a rectangle with a width of and a height of .

#### Steps

1. Start by setting up the formula.

2. Substitute the values for the width and height into the formula.

3. Evaluate the multiplication.

The area of the rectangle is equal to units squared.

### Example 2 This example shows how to calculate the area of a rectangle with a width of and a height of .

#### Steps

1. Start by setting up the formula.

2. Substitute the values for the width and height into the formula.

3. Evaluate the multiplication.

The area of the rectangle is equal to units squared.

### Example 3 This example shows how to calculate the area of a rectangle with a width of and a height of .

#### Steps

1. Start by setting up the formula.

2. Substitute the values for the width and height into the formula.

3. Evaluate the multiplication.

The area of the rectangle (also a square) is equal to units squared.

## Explanation The area of the rectangle formula can be verified first by counting individual square units and by using the properties of multiplication. For example, the area of a rectangle with a width and a height of is equal to units squared. This is verified, as shown below, by counting. The area of this rectangle can also be verified using the properties of multiplication. Namely, multiplication can be thought of as a “groups of” operator. In this case, the area of the rectangle can be represented as groups of as shown below. This corresponds to the arithmetic expressions below.