tetrahedron
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triangular pyramid
Tetrahedron - basic to theory of chemical bonds and one of the classic Platonic solid shapes
Triangular pyramid.
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.
Tetrahedron or triangular pyramid.