The volume \( V \) of a sphere can be calculated using the formula:
\[ V = \frac{4}{3} \pi r^3 \]
where \( r \) is the radius of the sphere.
Given that the radius \( r \) is 9 cm, we can substitute that value into the formula:
\[ V = \frac{4}{3} \pi (9)^3 \]
First, calculate \( 9^3 \):
\[ 9^3 = 729 \]
Now substitute \( 729 \) back into the volume formula:
\[ V = \frac{4}{3} \pi (729) \]
Now multiply \( \frac{4}{3} \) by \( 729 \):
\[ V = \frac{4 \times 729}{3} \]
Calculating \( 4 \times 729 \):
\[ 4 \times 729 = 2916 \]
Now divide by 3:
\[ \frac{2916}{3} = 972 \]
Thus, the volume of the sphere is:
\[ V = 972 \pi , \text{cm}^3 \]
So the volume of the sphere, in terms of \( \pi \), is:
\[ \boxed{972 \pi} , \text{cm}^3 \]