With 4 faces it is a tetrahedron.
It is also called a triangular pyramid.
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A tetrahedron, or triangle-based pyramid, has four corners, four faces and six edges.
5 faces 9 edges 6 corners
You count them. Let's look at a square, it has 4 edges. Just count the sides of the shape. Vertice = corners (point) Faces = the flat surface areas Edges = sides of the shape that makes up the shape like the outline of a shape.
A triangular based pyramid is usually called a tetrahedron and it has 4 faces, 6 edges and 4 corners (usually called vertices)
rectangular pyramid