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

640 $ft^{3}$
We have to consider the pentagonal prism as composed by a triangular prism and a parallelepiped Volume = Volume of the triangular prism + Volume of the parallelepiped Volume = $\frac{8 ft \times 2 ft \times 10 ft }{2}$ + (8 ft $\times$ 7 ft $\times$ 10 ft) Volume = 640 $ft^{3}$