Four(4).
It is formally named as a 'tetrahedron'.
There is the triangular base ; one side. and three triangular faces m aking for a total of four faces.
A square based 'pyramid' is formally a 'pyramid'.
A square base and four triangular faces.
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The faces are the flat, triangle-shaped surfaces that make up the surface of the pyramid. A pyramid has four faces.
a pyramid with a triangular base has 4 faces. a pyramid with a square base has 5 faces.
A triangular based pyramid has 4 flat faces, 6 edges and 4 vertices.
A pyramid normally has flat faces
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).