Area of a Rectangle
Calculate the area of a rectangle using A = l × w (length times width).
Simple formula with practical examples.
The Formula
A = l × w
The area of a rectangle is simply its length multiplied by its width.
This is one of the most commonly used formulas in everyday life.
Variables
| Symbol | Meaning |
|---|---|
| A | Area of the rectangle |
| l | Length (the longer side) |
| w | Width (the shorter side) |
Example 1
Find the area of a room that is 5 m long and 4 m wide
A = l × w = 5 × 4
A = 20 m²
Example 2
A photo is 8 inches by 10 inches. What is its area?
A = l × w = 10 × 8
A = 80 square inches
When to Use It
Use the area of a rectangle formula when:
- Calculating floor space, wall area, or land size
- Figuring out how much paint, carpet, or tile you need
- Determining the size of screens, photos, or paper
- Working with any four-sided shape with all right angles