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The formula for the volume of a sphere is V = (4/3)Ï€r^3, where r is the radius.
Plugging in the radius of 9 cm:
V = (4/3)Ï€(9)^3
V = (4/3)Ï€(729)
V = 972Ï€
Therefore, the volume of a sphere with a radius of 9 cm is 972Ï€ cubic cm.