A prism inscribed in a cylinder is a prism whose base planes are the base planes of the cylinder, and the side edges are those forming the cylinder.
A tangent plane to the cylinder is a plane passing through the generator of the cylinder and perpendicular to the plane of axial section containing this generator.
A prism described near a cylinder is called a prism, in which the planes of the bases are the planes of the bases of the cylinder, and the side faces touch the cylinder.
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