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29-03-2017
Mathematics

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PLEASE HELP ASAP
Find the approximate radius of a sphere with a surface area of 400 square inches. A. 5.64 inches B. 31.8 inches C. 31.4 inches D. 20 inches

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Аноним Аноним

29-03-2017

Surface area = 4πr²
⇒ 400 = 4 * 3.14 * r²
⇒ r² = 400/12.56
⇒ r² = 31.84
⇒ r = √31.84 = 5.64 inches

Answer is A.

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