The surface of a sphere is calculated pi*d2 or 4 *pi*r2
So if you have a sphere with diameter 8 (units) the area is 804.25 inches squared
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The formula for the surface area of a sphere is 4 (pi) r2For a radius of 5 in, the surface area is4 (3.1416) (5)2 = 4 (3.1416)(25) = about 314.16 square inches
You divide the diameter by 2, to get the radius. Then you use the formula for the surface area of a sphere. Surface area of a sphere = 4*pi*radius^2
Use this formula (Ï€ = Pi): Surface area = 4Ï€r2
The surface area of a sphere with a radius of 2 is about 50.27 units2
The surface area of the sphere with the radius doubled is 200 units2.---> Confirmed