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Volume = 4/3r3
V = 4/3r3
Surface = 4r2
S = 4r2

A sphere cut by a plane passing through its center forms two hemispheres. The plane surface of a hemisphere is a circular region.
Curved surface area of a hemisphere = 2r2
Total surface area of a hemisphere = 2r2+ r2
= 3r2
Volume of a hemisphere = 2/3r2
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If R and r are the outer and inner radius of a hollow sphere, then,
Volume of the material in the spherical shell = 4/3(R3- r3)
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