Math Help Surface Area
December 9th, 2009
Question: Math Help??? (surface area)?
A cylindrical storage drum has a radius of 2.16 feet and a height of 3.88 feet. Estimate the total surface area of the drum.
(Use Total Surface Area= 2(pi)rh + 2(pi)r(squared))
A. 60 ft(squared)
B. 66 ft(squared)
C. 72 ft(squared)
D. 68 ft(squared)
Answer: The answer is B: 66 ft. squared.
Solution: 2 x 3.14 x 2.16 x 3.88 + 2 x 3.14 x 2.16 = 66.196224
My husband did this in his head, and proved it with the calculator afterwards.
Surface Area and Volume of a Sphere – YourTeacher.com
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