A pyramid must have at least four faces (sides) so a three sided pyramid is mathematically impossible.
Wow, really... a pyramid is three sided and it has been used as a tomb. (technically it's 4 sided, three sides and a bottom, but that's as close as your going to get to a three sided tomb, especially in geometry...)
A 3 dimensional triangle is called a pyramid, otherwise a 2D three sided polygon shape is exactly what you called it, a triangle.
A three sided pyramid has four sides and six edges (think four sided die used in role playing games).
Tetrahedrons are 4-sided solids. A regular tetrahedron is the equilateral pyramid, having one pyramid as the base and three others the sides.
=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.
A three-sided pyramid is called a triangular pyramid or a tetrahedron. It has four faces, with three being triangular faces and one being a triangular base.
A 7 sided pyramid would be called a heptahedral or heptahedron.
Yes, its called a three sided pyramid
A three sided trangle
if its a four sided pyramid then four. if its a three sided pyramid then four.
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 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.
i am not sure, but i think it is 4 sided.