SA = 4πr²
Plug the radius into this formula (tip: half of the diameter)
Which will give u 452.16 cm2
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A sphere has less surface with the same diameter.
The sphere's diameter is 3.921 cm
Surface area of sphere: 4*pi*15^2 = 900*pi square cm
A surface area of 804.2 cm2
It means that the statement is referring to a circle or a sphere whose diameter measures 12 inches.