measure the radius of the sphere and apply the appropriate volume equation:
V= (4/3) x (pi) x r3
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The question is ambiguous. Do you mean how many cubic feet are in a sphere with radius of 30 feet?
d = 6.2035 feet.
r = 6.6825 feet.
It is about: 4/3*pi*2^3 = 33.5 cubic feet
A sphere having a diameter of 9.5 feet has a surface area of 283.53 square feet and a volume of 448.92 cubic feet.