It is called the base.
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any face that is not a base is?
Apex.
A cone has 1 face, 0 edges, and one vertex. The face is the circular flat area. The cone can roll, so it has no edges. Edges have to be straight. The vertex is the pointy thing opposite to the face.
there is one square face, and then four triangular faces that join at the vertex.
A square based pyramid has 4 triangular faces which means it has a total of 5 faces