Formula for the area of a rectangle

How To Find The Area of a Rectangle Using Area of Rectangle Formula.

A = L * W where A is the area, L is the length, W is the width, and * means multiply.

Let's look at some examples of finding the area of rectangles.

Solution: 

Solution: A = L * W

A = (8 cm) · (3 cm) = 24 cm2

In Examples 1 and 2, we found the area of a recentangle given the dimensions of the rectangle. Let's look at some examples in which we are given the area of the rectangle, and are asked to work backwards to find the missing dimension.

Solution: 

9 cm2 = 

Since 3 · 3 = 9, we get 3 cm · 3 cm = 9 cm2. So 

Solution: A = L * W

12 in2 = L * 3in

Since 4 · 3 = 12, we get (4 in) · (3 in) = 12 in2. So L must equal 4 in.

L = 4 in.

A = L * W  where L is the length and W is the width.

Exercises

Directions: Read each question below. Click once in an ANSWER BOX and type in your answer; then click ENTER. Your answers should be given as whole numbers greater than zero. After you click ENTER, a message will appear in the RESULTS BOX to indicate whether your answer is correct or incorrect. To start over, click CLEAR. This will help you practice finding the area of a rectangle.