Let the radius of the sphere be r.
surface area of the sphere = 4 * pi * r^2
volume = (4 * pi * r^3)/3
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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
The surface area of a sphere with a radius of 7 is about 615.8 units2
a. 2 to 5.
The sphere's surface area is ~1,017.9 square units.