Answer
V$\approx$1082.76 ft$^3$
Work Step by Step
h$^2$=l$^2$-a$^2$
h$^2$=225-64=
h=$\sqrt {161}$
V=$\frac{1}{3}$(16$^2$)($\sqrt {161}$)
V=$\frac{256\sqrt {161}}{3}$
V$\approx$1082.76 ft$^3$
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