cbrusoe

Two similar cylinders have heights 6 inches and 15 inches.
What is the ratio of their surface areas?
Answer
4 : 25
8 : 25
9 : 10
9 : 25

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jhonyy9

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the surface area of a cylinder is 2pir *height
so than the ratio will be 6/15 = 2/5

cwrw238

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6^2 : 15^2

cwrw238

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or 4:25

quakeash

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the surface area for the cylinder is the same as the circle and has nothing to do with height

quakeash

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|dw:1337716417085:dw|

cwrw238

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2 cylinders are similar so areas in ratio of squares of corresponding lengths

cbrusoe

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oh ok thank-you guys

jhonyy9

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quakeash this not is right because the surface area of a cylinder is 2 time area of base (down and up) + lateral area what is curcumpherance of base time height of cylinder

jhonyy9

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circumpherance sorry

cbrusoe

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wait the answer is stil 4:25 right?

cwrw238

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yes cbrusoe - its 4:25

cbrusoe

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ok thank-you

cwrw238

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yw