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# Cylinder

A cylinder is a three-dimensional figure that has two circular bases that are parallel and equal in size, connected by a curved surface.
The axis of a cylinder is the segment that connects the center of the bases. The height of a cylinder is the perpendicular distance between the bases. The radius of the cylinder is the radius of one of the bases.
If the axis of a cylinder is not perpendicular to the bases, it is called an oblique cylinder.
If the dimensions of a cylinder are known, then its volume and surface area can be calculated.