## Elementary Geometry for College Students (5th Edition)

$110.4$
Recall, in part a we found: $tan72^{\circ}=\frac{h}{3} \\ h = 3tan72^{\circ} =9.2$ Thus, we find the volume of the pyramaid, which is equal to: $V=(1/3)(A_{base})(h) = (1/3)(9.2)(6^2) = (1/3)(9.2)(36) = 110.4$