Because it is not and it is 4*pi*radius2 measured in square units.
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The formula for the surface area of a sphere.
The surface area of a sphere with radius 6 is: 452 square units.
The surface area of a sphere with a radius of 7cm is about 615.8cm2
The surface area of a sphere with a radius of 13ft is about 2,123.7ft2
The surface area of a sphere with a radius of 42cm is about 22,167cm2