Lecture
A polyhedron is such a body whose surface consists of a finite number of flat polygons.
A polyhedron is said to be convex if it is located on one side of the plane of each flat polygon on its surface. The common part of such a plane and the surface of a convex polyhedron is called a face . The faces of a convex polyhedron are flat convex polygons. The sides of the faces are called the edges of the polyhedron , and the vertices are the vertices of the polyhedron .
The simplest polyhedra: cube, prism, pyramid.
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