Surface area of a sphere = 4*pi*radius2
radius = diameter/2
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The surface area of a sphere with a diameter of 7cm is 153.9cm2
201.06 inches2
The surface area of a sphere with a diameter of 10 is about 314.16 units2
This sphere's surface area is 201.06 mm2
Surface area of a sphere = 4*pi*radius2 Surface area = 16*pi = 50.26548246 or 50 square inches.