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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.
