Cylinder surface area

The volume of a cylinder whose height is equal to the radius of the base is 678.5 dm3. Calculate its surface area.

Correct answer:

S =  452.3893 dm2

Step-by-step explanation:

V=678.5 dm3  h = r V = π r2 h = π r3  r=[3V/π]=[3678.5/3.1416]=6 dm h=r=6 dm  S=2π r2+2π r h=2 3.1416 62+2 3.1416 6 6=452.3893 dm2

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