A convex polyhedron is said to be correct if its faces are regular polygons with the same number of sides and the same number of edges converges at each vertex of the polyhedron.
The tetrahedron faces have regular triangles. Each vertex converges on three edges. The tetrahedron is a triangular pyramid, in which all edges are equal.
All faces of a cube are squares. Each vertex has three edges. A cube is a rectangular parallelepiped with equal edges.
The octahedron faces have regular triangles. Each vertex converges on four edges.
The dodecahedron faces have regular pentagons. Each vertex converges on three edges.
The icosahedron faces have regular triangles. At each point, five edges converge. |
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Stereometry
Terms: Stereometry