3. Volumes. Volume. Let’s review how to find volume of a regular geometric prism. Whether it be a circular prism (cylinder), triangular prism, rectangular prism, etc., if we can find the area of the face, we need only to multiply by the distance between the two faces, h. In general V = A*h.
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V = A * h
What if the graph doesn’t reach the axis you are rotating around?
Now there will be a void or hole
This makes the cross section a washer
Make sure you square each function separately,
Don’t subtract first and then square!!