Surface area of sphere = Pi x diameter2 = Pi x (2r)2 = Pi x 256 (approximately 804.25 square units).
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The surface area of a sphere with a radius of 7 is about 615.8 units2
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
The surface area of the sphere with the radius doubled is 200 units2.---> Confirmed
The area of a sphere with radius 'R' is [ 4 pi R2 ].
The surface area of a sphere with a radius of 2 is about 50.27 units2