# Volumes of solid with known cross-sections

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##### Intros

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##### Examples

###### Lessons

- A solid has a base bounded by $y=- {x\over2}+1$, $x=-2$,and $x=1$. If the parallel cross-sections perpendicular to the base are squares, find the volume of this solid.
- A solid has a base bounded by these two curves, y= sin x, y= cos x. If the parallel cross-sections perpendicular to the base are equilateral triangles, find the volume of this solid.