To find the surface area of a rectangular prism, you need to add up the areas of all six sides of the prism. The formula for the surface area of a rectangular prism is:

Surface area = 2 * (lw + wh + lh)

where:

- l is the length of the prism
- w is the width of the prism
- h is the height of the prism

To use the formula, simply multiply the length, width, and height of the prism together and add the three products together. Multiply the result by 2 to get the total surface area of the prism.

Here is an example of how to find the surface area of a rectangular prism:

A rectangular prism has a length of 5 inches, a width of 3 inches, and a height of 2 inches.

Surface area = 2 * (5 * 3 + 3 * 2 + 5 * 2)

Surface area = 2 * (15 + 6 + 10)

Surface area = 2 * 31

Surface area = 62 square inches

Therefore, the surface area of the rectangular prism is 62 square inches.

Here are some tips for finding the surface area of a rectangular prism:

- Make sure that you have all of the necessary measurements. To find the surface area of a rectangular prism, you need to know the length, width, and height of the prism.
- Use the correct formula. The formula for the surface area of a rectangular prism is:

Surface area = 2 * (lw + wh + lh)

- Double-check your work. Once you have calculated the surface area of the prism, double-check your work to make sure that you have made no errors.

## Applications of surface area of a rectangular prism

The surface area of a rectangular prism is used in a variety of applications, including:

- Packaging: The surface area of a rectangular prism is used to calculate the amount of packaging material needed to wrap a product.
- Painting: The surface area of a rectangular prism is used to calculate the amount of paint needed to paint a room or other structure.
- Building: The surface area of a rectangular prism is used to calculate the amount of material needed to build a structure, such as a house or office building.

## Conclusion

The surface area of a rectangular prism is an important concept in mathematics and has a variety of applications in the real world. By using the formula and tips provided in this article, you can easily find the surface area of any rectangular prism.