Surface Area of Rectangular Prism Worksheets

Examples, solutions, videos, and worksheets to help grade 5 learn how to find the surface area of a rectangular prism.

How to find the surface area of a rectangular prism?

To find the surface area of a rectangular prism, you need to calculate the areas of its six faces and then add them together. The formula for the surface area of a rectangular prism is:

Surface Area (SA) = 2lw + 2lh + 2wh

• l is the length of the rectangular prism.
• w is the width of the rectangular prism.
• h is the height of the rectangular prism.

Here’s a step-by-step guide to finding the surface area of a rectangular prism:

1. Measure the length (l), width (w), and height (h) of the rectangular prism in units.
2. Use the formula above to calculate the surface area. Multiply each pair of sides by 2 and add them together.
3. Plug the values of length, width, and height into the formula:
   SA = 2lw + 2lh + 2wh

Example:
Find the surface area of a rectangular prism with the following dimensions:
Length (l) = 4 units
Width (w) = 3 units
Height (h) = 5 units

Using the formula:
SA = 2lw + 2lh + 2wh
SA = 2(4)(3) + 2(4)(5) + 2(3)(5)

Now calculate each term:
2lw = 2(4)(3) = 24 square units
2lh = 2(4)(5) = 40 square units
2wh = 2(3)(5) = 30 square units

Now, add these areas together:
SA = 24 + 40 + 30
SA = 94 square units

So, the surface area of the rectangular prism is 94 square units.

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