You can put this solution on YOUR website! find the volume of a hemisphere when the diameter is 22 cm
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Volume of a sphere: V = (4/3)(pi)r^3
Volume of a hemi-sphere Vh = (2/3)(pi)r^3
Your Problem:
radius = 11 cm
Vh = (2/3)(pi)11^3
Vh = 2787.64 cm^3
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Cheers,
Stan H.