=Pyramid=
Pyramid
Tetrahedron. http://en.wikipedia.org/wiki/Tetrahedron
the pointy pyramid is just that a pyramid
Khafre Pyramid
A four sided pyramid is called a square based pyramid. It has a square base and four sides,(called edges,) that join at the apex. (the top of the pyramid.)
A pentagonal pyramid.
A triangular pyramid.
A triangular pyramid A triangular pyramid has four sides - each of which is a triangle. There cannot be a three sided pyramid. If you mean a 3 sided Pyramid with its base being the forth side it would be a Quadrangle. A four-sided triangular solid is also called a tetrahedron, and two interlaced are called a Star Tetrahedron.
If you mean a pyramid with a four sided base, it is a square pyramid. If you mean one with four faces, it is a tetrahedron.
Octagonal pyramid
=Pyramid=
a pyramid
Yes, it is called a tetrahedron or a triangular pyramid.
the typical 4 sided pyramid with a square base has 8 edges.
well actually it is a prism. If you mean a 5 sided pyramid with the 6 side being the bottom it would be called a Pentagonal Pyramid
A cube has 12 edges. A 4-sided pyramid has 8 edges. A 3-sided pyramid has 6 edges. There are also other pyramids with more sides.