# Volume using calculus

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Integrals can be used to find 2D measures (area) and 1D measures (lengths). But it can also be used to find 3D measures (volume)! Learn all about it here.

Let's leverage the definite integral to find volumes of figures where we know what their cross sections look like. It is surprisingly fun.

You know how to use definite integrals to find areas under curves. We now take that idea for "spin" by thinking about the volumes of things created when you rotate functions around various lines.

Washer method is an extension of the Disk method for finding the volumes of more elaborate solids of revolution.

Shell method offers us another way of calculating the volume of solids of revolution. Some solids are more easily found with the shell method.