Body rotation. Cylinder

Evidence

A cylinder is a body that consists of two circles that are not lying in the same plane and are combined by a parallel translation, and all the segments connecting the corresponding points of these circles. The circles are called the bases of the cylinder , and the segments connecting the corresponding points of the circles of circles are forming the cylinder .
A cylinder is called straight if its generators are perpendicular to the planes of the bases.
The radius of the cylinder is the radius of its base. The height of the cylinder is the distance between the planes of its base. The axis of the cylinder is called a straight line passing through the centers of the bases. It is parallel to the generators.