the base of a triangular pyramid is 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.
This 3D shape could be a square based pyramid.
A tetrahedron looks like a pyramid but instead of having a square base, it has a triangular base.
A triangular PYRAMID has a triangular base.
A pyramid which we normally call a triangular- based pyramid has 4 triangular phases (including the base, so that means the base of a normal pyramid is triangular) but a a square pyramid has a square phase to its base and the other 4 phases are triangular. so that can be identified as the difference between a pyramid and a square pyramid.