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There are five regular polyhedra, also known as the Platonic solids. They are three-dimensional shapes where all of the faces are made up of the same regular polygon.
They are:
- Tetrahedron with four faces (this one is like a pyramid, but with an equilateral triangle for the base and all of the faces)
- Cube with six faces (all squares)
- Octahedron with eight faces (all equilateral triangles)
- Dodecahedron with 12 faces (all regular pentagons)
- Icosahedron with 20 faces (all equilateral triangles)
A square pyramid (like the Egyptian pyramids) is not a regular polyhedron, because it has two different types of regular polygons for faces.
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Is a triangular pyramid a regular polyhedron?
A triangular based based pyramid is a TETRAHEDRON. It becomes a regular tetrahedron if the four triangles, that make up its shape, are REGULAR, that is they are all the same size by area and shape; that is they are congruent. The word 'polyhedron' means a solid shape of any number of sides.
Is a square pyramid a polyhedron?
Yes.
How is a rectanglar prism like a pyramid?
It is a polyhedron.
Is a sphere a polyhedron?
No, a sphere is not a polyhedron.A polyhedron is a three-dimensional geometric figure whose sides are polygons.A regular polyhedron is a polyhedron whose faces are all congruent regular polygons.
What do you call a pyramid with a square base?
Square Based PyramidTetrahedron: A tetrahedron is a polyhedron made of 4 triangles. A "regular tetrahedron" is a tetrahedron where the triangles are equilateral. (A polyhedron is any 3 dimentional figure made of flat surfaces and straight lines.)
