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Tiếng ViệtGraphs and NetworksEuler
Many planar graphs look very similar to the nets of A polyhedron (the plural is polyhedra) is a three-dimensional solid with no curved surfaces or edges. All faces of a polyhedron are polygons. For example, a cube and a pyramid are polyhedra, but a sphere is not. A polygon is geometric shape that is made up of straight line segments. Polygons cannot contain any curved sides, or holes. For example, a square is a polygon but a circle is not.
