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Is a cube a polyhedron?
Yes. It is one of the five regular polyhedra known from ancient Greek times or earlier.See http://www.math.rutgers.edu/~erowland/polyhedra.html .
What do two tetrahedrons joined face to face make?
A regular triangular dipyramid. It is one of the 92 "Johnson solids". Those are the convex polyhedra whose faces are regular polygons, but do not belong to either of the two sets of highly symmetric polyhedra (the Platonic and the Archimedean), or to the perhaps less interesting two infinite families of prisms and antiprisms.
What is the difference between a polyhedron and polyhedra?
One polyhedron; many polyhedra. Simple,wasn't that?
What is a five-sided polygon?
A five-sided polygon is called a pentagon. A regular five-sided polygon is simply called a regular pentagon
How many edges does a polyhedron have?
That depends on the kind of polyhedron.There are five kinds of regular polyhedra (all edges of equal length).Tetrahedron (four-sided pyramid) has 6 edgesHexahedron (cube) has 12 edgesOctahedron (eight-sided solid) has 12 edgesDodecahedron (12-sided solid) has 30 edgesIcosahedron (20-sided solid) has 30 edgesIt is also possible to have a polyhedron that is not regular, with almost any number of sides and edges.
What are five types of regular polyhedra?
tetrahedron, cube, octahedron, dodecahedron and icosahedron.
What is a regular polyhedra with 12 regular pentagon faces?
dodecahedron
What is a 7 regular polyhedra?
There are only 5 regular polyhedra: those with 4, 6, 8, 12 and 20 faces. If you know of 7 polyhedra there may be a Fields Medal (the Nobel prize for mathematicians) for you!
What is unique about the platonic solids?
They are regular polyhedra.
Is an icosahedron a semi-regular or regular polygon?
An icosahedron is in fact not a polygon at all, but a polyhedron. As a polyhedron it is regular however. The regular icosahedron is one of only five possible regular polyhedra. It has 20 faces, each of which is an equilateral triangle.
Is a cube a polyhedron?
Yes. It is one of the five regular polyhedra known from ancient Greek times or earlier.See http://www.math.rutgers.edu/~erowland/polyhedra.html .
Is a cone a Platonic solid?
No, a cone is not a Platonic solid. The Platonic solids are the five regular polyhedra: tetrahedron, cube, octahedron, dodecahedron, and icosahedron.
Does the platonic solids consist of regular polyhedra?
Yes, they do.
Which figures have congruent bases?
Prisms, regular polyhedra.
Witch polyhedra has 12 regular pentagons as faces?
dodecahedron
What shapes have identicle faces?
Regular polyhedra have identical faces.
Is circle regular or irregular?
Regular, although the term is more usually used with polygons and polyhedra.
