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