Instead of telling you the answer, think: What does it mean to have the pyramidal Shape?
Hint: There are many many cases, but only the "base" is changing, the side is always the same shape.
Triangular.A pyramid has triangular faces
This 3D shape could be a square based pyramid.
A pyramid shape, by default, has a square base. It therefore has 5 faces.
Triangular Pyramid......... The faces are Triangular....
A shape that has some triangular faces is a pyramid.
The faces of a pyramid are typically triangular, with the exception of the base, which is usually a polygon (often a square or rectangle). Each triangular face connects the apex (top point) of the pyramid to the edges of the base. In a regular pyramid, all triangular faces are congruent, while in irregular pyramids, they can vary in shape and size.
All except the base are always triangles; the shape of the base gives the name to the pyramid; eg a pentagonal pyramid has a pentagon as the base and five triangular faces; a triangular pyramid has three triangular faces and also has a triangle for the base.
Pyramid
A pyramid!
Pyramid
pyramid
Pyramid, but to be exact it would be a Triangular Pyramid ;) * * * * * To be exact ... but WRONG! A triangular pyramid has 4 faces and 4 vertices! A shape with 5 faces and vertices is a quadrilateral based pyramid - of which a special case would be a square based pyramid.