Answer
V$\approx$288.7 in$^3$
Work Step by Step
200=.5(4)(x)(x)
200=2x$^2$
100=x$^2$
x=10
h$^2$=x$^2$-(.5x)$^2$
h$^2$=75
h=$\sqrt 75$
h=5$\sqrt 3$
V=$\frac{1}{3}$Bh
V=$\frac{1}{3}$(100)(5$\sqrt 3$)
V=$\frac{500\sqrt 3}{3}$
V$\approx$288.7 in$^3$