# Right Circular Cylinder Basics

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The following figure shows a right circular cylinder:

Note that the *cross-section* of a right circular cylinder is a circle, and the *axis* of the cylinder is perpendicular to the base.

Below is an example of a right cylinder which is not circular (the cross-section is not a circle):

Below is an example of a circular cylinder which is not right (the cross-section is circular, but the axis is not perpendicular to the base):

From now on, we will only discuss right circular cylinders, and refer to them as simply cylinders. Observe that a cylinder’s dimensions can be specified by two parameters: the radius *r* of the flat face (or the base), and its height *h*, as shown below.

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