Mathematics
jdawes351
44

A cylinder has a surface area of 339cm. The radius is two times greater than the height. what is the radius of the cylinder.

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(1) Answers
ItssHannahh

The answer is 6 cm. The surface area of the cylinder is: SA = 2πr² + 2πrh SA = 339 r = 2h ⇒ h = r/2 r = ? π = 3.14 339 = 2πr² + 2πr*r/2 339 = 2πr² + πr*r 339 = 3πr² πr² = 339/3 πr² = 113 r² = 113/π r² = 113/3.14 r² ≈ 36 r = √36 r = 6

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