Describe the two methods presented in the video for calculating the surface area of a rectangular prism.

The two methods are: 1) unfolding the prism into a net, finding the area of each face, and adding them together; and 2) using the formula SA = 2B + pH, where B is the area of the base, p is the perimeter of the base, and h is the height of the prism.

A rectangular prism has dimensions of length 5 cm, width 2 cm, and height 3 cm. Calculate its surface area using the net method. Show your work.

Area of two 5x2 faces: 2 * (5*2) = 20 cm². Area of two 5x3 faces: 2 * (5*3) = 30 cm². Area of two 2x3 faces: 2 * (2*3) = 12 cm². Total surface area: 20 + 30 + 12 = 62 cm².

Using the formula SA = 2B + pH, calculate the surface area of a rectangular prism with a base that is 6 inches by 4 inches and a height of 2 inches. Show each step.

B = 6 * 4 = 24 in². p = 6 + 6 + 4 + 4 = 20 in. SA = 2 * 24 + 20 * 2 = 48 + 40 = 88 in².

Surface Area Of Rectangular Prisms Lesson Plan for Grade 8th Grade

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Learning Objective

I can calculate the surface area of a rectangular prism.

1
One way to find the surface area of a rectangular prism is to unfold the prism into a net and find the area of each face.
2
The formula for finding the surface area of a rectangular prism is SA = 2B + pH, where B is the area of the base, p is the perimeter of the base, and h is the height of the prism.
3
When using the net method, remember to find the area of each face and then add all of the areas together.

Surface Area of Rectangular Prisms

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Learning Objective

Warm-Up Video

Key Concepts

Practice Questions

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