Chapter 11 - Surface Area and Volume - 11-5 Volumes of Pyramids and Cones - Practice and Problem-Solving Exercises - Page 729: 6

$1296 \ in^3$

The volume of a square pyramid can be obtained as: $Volume =\dfrac{1}{2} \times b\times h=\dfrac{1}{2} \times S^2 \times h$ Plug the values of $S$ and $h$ into the formula to obtain: $Volume=\dfrac{1}{2} \times (18)^2 \times (12)\\=\dfrac{1}{2} \times 3888 \\=1296 \ in^3$