(3) Quartz
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.
Smooth [sided] pyramid Step [sided] pyramid Bent pyramid
A tall four sides structure with a pyramid on the top was called
Smooth sided style.
The pyramid of Pharaoh Djoser dates from about 2,630 B.C. and is a 'step pyramid'. The great Pyramid of Giza - Pharaoh Khufu - dates from about 2,550 B.C. and is a true pyramid, that is, smooth sided. The Pyramid of Djoser was Egypt's first pyramid.
Quartz
A 7 sided pyramid would be called a heptahedral or heptahedron.
A pentagonal pyramid.
A triangular 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 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.
It's a quarts. This isn't much info but maybe this will help
=Pyramid=
a pyramid
Yes, it is called a tetrahedron or a triangular pyramid.
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