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The formula for the volume of a sphere is V = (4/3)Ï€r^3, where r is the radius.
Substituting r = 9 into the formula, we get:
V = (4/3)Ï€(9^3)
V = (4/3)Ï€(729)
V = (4/3) * 729 * π
V = 972Ï€
Therefore, the volume of the sphere is 972Ï€ cubic units.