4 * pi * radius * radius
or
(pi * diameter * diameter) / 3
Also ( 4 * 3.14 * radius squared )
Also ( 88/7 * radius squared )
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Surface area of a sphere = 4*pi*radius2
Surface area of a sphere = 4*pi*radius squared
The area of a sphere is 4πr2.
Surface area of a sphere = 4 x (pi) x (radius)2
The surface area of the sphere with the radius doubled is 200 units2.---> Confirmed