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# The base of $S$ is a circular disk with radius $r .$ Parallel cross-sections perpendicular to the base are isosceles triangleswith height $h$ and unequal side in the base.(a) Set up an integral for the volume of $S .$(b) By interpreting the integral as an area, find the volumeof $S .$

## $$V=\frac{1}{2} \pi r^{2} h$$

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