My personal notes on using the method of disks.
Remember, Calculus is all about the infinitesimal. In this example I graph the region and split it up into an infinite number of disks and sum them all together.
The idea of finding volumes by slicing/disks/washers is one explored in great detail in most Calculus 2 courses. You have to visualize the graph not as a whole, but as many smaller parts added together.
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