9
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Surface Area of Prisms

Question 9 • FL-1205040-M/J Grade 7 Mathematics B -GF

Which could be the dimensions of a rectangular prism whose surface area is greater than 140 square feet? Select three options.

Answer
A
6 feet by 2 feet by 3 feet
B
6 feet by 5 feet by 4 feet
C
7 feet by 6 feet by 4 feet
D
8 feet by 3 feet by 7 feet
E
8 feet by 4 feet by 3 feet

Explanation

For a rectangular prism, surface area is 2(lw + lh + wh). The surface areas are A: 72, B: 148, C: 188, D: 202, and E: 136 square feet. The options greater than 140 square feet are B, the 6-by-5-by-4 prism; C, the 7-by-6-by-4 prism; and D, the 8-by-3-by-7 prism.

AI-written and checked against the verified answer.

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