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Given that circumference of a sphere(C) = 18 cm.

$\"\"$ (Circumference of a sphere)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Divide each side by $\"\"$ )

$\"\"$ (Cancel common terms) $\"\"$

Volume(V):

$\"\"$ (Volume of a sphere)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Evaluate powers)

$\"\"$ (Simplify)

$\"\"$ (Multiply)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Evaluate powers)

$\"\"$ (Divide) $\"\"$

The volume of the sphere is approximately 99.1 cubic inches.