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.
A triangular pyramid.
Its called a 9 sided pyramid.
Yes, its called a three sided pyramid
if its a four sided pyramid then four. if its a three sided pyramid then four.
A three sided trangle
A 7 sided pyramid would be called a heptahedral or heptahedron.
An eight sided pyramid would be a heptagon-based pyramid.
Smooth [sided] pyramid Step [sided] pyramid Bent pyramid
A pyramid must have at least four faces (sides) so a three sided pyramid is mathematically impossible.
A pentagonal 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.)