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Cylinders

Cylinders

From the course: Test Prep: GRE

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Cylinders

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- [Voiceover] And one last shape you may have to deal with in geometry is a three-dimensional cylinder. A lot of times we call these right circular cylinders. Let me draw one for you. You can picture a can; that's a good way to picture a cylinder. We call these right circular cylinders because if you draw a line from the center of the top circle to the bottom circle, it's going to be at a right angle to the base, like that. So there's a formula for this that we should know, and it's the formula for the volume of it. So its volume equals pi times the radius squared times its height. So let's say that the radius of this top circle was four, let's say. That's gonna mean that this bottom radius is four as well, and let's say that the height is, I don't know, eight. Okay, so we can plug into the formula now to solve for this cylinder's volume. So let's do that. If we have pi times four squared times eight, that's going to be the volume. So let's simplify that to pi times sixteen times…

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