## Algebra 2 (1st Edition)

$\frac{4}{\pi}$
The volume of the square pyramid: $\frac{1}{3}(2r)^2h$ The volume of the inscribed cone:$\frac{1}{3}\pi r^2h$ The ratio: $\frac{\frac{1}{3}(2r)^2h}{ \frac{1}{3}\pi r^2h}=\frac{4}{\pi}$