An icosahedron is a regular polyhedron with 20 faces, all of which are equilateral triangles. An icosahedron has 30 edges and 12 vertices. Five equilateral triangles meet at each vertex.
Know MoreAn icosahedron is an example of a Platonic solid, which is a polyhedron that is regular, convex, made of congruent faces of regular polygons, and has the same number of faces meeting at each vertex. Only five known shapes meet this criteria.
The other Platonic solids include the tetrahedron with four triangular faces, the cube, or hexahedron, with six square faces, the octahedron with eight triangular faces and the dodecahedron with twelve pentagonal faces.
Learn more about ShapesA cube has six faces. An example of a cube is a dice where every face is numbered from one to six. A cube has edges of equal length, and all the angles are right angles (90 degrees).
Full Answer >A sphere has no faces, edges or vertices. By definition, it is a curved three-dimensional geometric figure whose surface is defined as the set of all the points equidistant from its center point.
Full Answer >A dodecahedron has 12 faces. Each face in a regular dodecahedron is a regular pentagon. A dodecahedron also has 30 edges and 20 vertices, and three edges meet at each vertex.
Full Answer >A rectangular pyramid has five faces, which consists of one rectangular face and four triangular faces. Pyramids are named after the shape of their base, which means a rectangular pyramid has a rectangle for a base.
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