The volume V of a sphere with radius r is given by the formula:
\[ V = \frac{4}{3} \pi r^3 \]
Given that the radius is 1.8 yards, we can substitute r with 1.8 yards into the formula to find the volume:
\[ V = \frac{4}{3} \pi (1.8)^3 \]
\[ V = \frac{4}{3} \pi (5.832) \] (since 1.8^3 = 5.832 exactly)
\[ V = 7.776 \pi \]
Rounding to the nearest hundredth, we get:
\[ V \approx 7.78 \pi \, \text{yds}^3 \]
So, the volume of the sphere in terms of pi, rounded to the nearest hundredth, is approximately \( 7.78 \pi \) cubic yards.