Height as diameter of base

The rotary cylinder has a height equal to the base diameter and a surface of 471 cm2. Calculate the volume of a cylinder.

Correct answer:

V =  784.801 cm3

Step-by-step explanation:

S=471 cm2 h = D h = 2r  S = 2 π r2 + 2 π r h S = 2 π r2 + 4 π r2 S = 6 π r2  r=S/(6π)=471/(6 3.1416)4.9987 cm h=2 r=2 4.99879.9975 cm  S1=π r2=3.1416 4.99872=2157=78.5 cm2  S2=2 S1+2π r h=2 78.5+2 3.1416 4.9987 9.9975=471 cm2  S2=S  V=S1 h=78.5 9.9975=784.801 cm3

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