i think its the triangle because the base is square and all the faces is triangular shaped so its the triangle
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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.
The bottom line of a shape is the base of the shape. For example, the bottom line of a pyramid is the base of the pyramid.
the base of a triangular pyramid is triangle
a pentagonal pyramid or a pentagonal prisim
A tetrahedron looks like a pyramid but instead of having a square base, it has a triangular base.