Surface Area of Sphere of radius r is S=4 pi r^2 by finding surface area of solid...

Claire007

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Verify the surface area of a sphere of radius r is: S=4pir2 by finding the surface area of the solid formed when the semi-circle given by: y=sqrt(r2 - x2) is rotated about the x-axis.
 
Verify the surface area of a sphere of radius r is: S=4pir2 by finding the surface area of the solid formed when the semi-circle given by: y=sqrt(r2 - x2) is rotated about the x-axis.
First sketch the given function (y=sqrt(r2 - x2) and follow instruction.

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