To find the volume \( V \) of a sphere, you can use 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 this value into the formula:
\[ V = \frac{4}{3} \pi (9)^3 \]
First, calculate \( 9^3 \):
\[ 9^3 = 729 \]
Now, substitute this back into the volume formula:
\[ V = \frac{4}{3} \pi (729) \]
Next, simplify:
\[ V = \frac{2916}{3} \pi \]
Calculating \( \frac{2916}{3} \):
\[ \frac{2916}{3} = 972 \]
Thus, the volume of the sphere is:
\[ V = 972 \pi \text{ cm}^3 \]
So, the final answer for the volume of the sphere in terms of \( \pi \) is:
\[ \boxed{972\pi \text{ cm}^3} \]