Polyhedron and Not Polyhedrons meaning shape example type classification definition
Polyhedron and not polyhedrons. Meaning of polyhedron. Shape of polyhedron. Example of polyhedron. Why are a cylinder, sphere and cone not polyhedron? Classification of polyhedrons. A polyhedron is a three-dimensional figure made of flat polygon-shaped surfaces called faces. The line segment where two faces intersect is called an edge. The point where
several edges meet is called a vertex. Some three-dimensional figures are not polyhedrons. For example, a cylinder has two circular bases that are parallel and congruent; a sphere has no base, a cone has one circular base. All these solid figures do not have bases that are polygons, that's why they are not polyhedrons. prism is a polyhedron with two congruent parallel polygon-shaped bases. A prism is named by the shape of its bases. The other faces are parallelograms; rectangular prism, pentagonal prism and triangular prism. A pyramid is a polyhedron that has one base. A pyramid is named by the shape of its base. Triangular faces join the edges of the base to a point outside the base, which is called a vertex, triangular pyramid, rectangular pyramid, and hexagonal pyramid.
Chapters:
0:00 - Introduction.
0:07 - Definition of polyhedron.
0:14 - Edge of polyhedron.
0:22 - Vertex of polyhedron.
0:31 - Examples of polyhedrons.
1:34 - Examples of not polyhedrons.
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