4. 1 at the bottom and 3 joininq on to it. Simples.
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It makes a Triangular Pyramid.
If you arrange them in the form of a tetrahedron - a triangular pyramid.
It will look like a 2D equilateral triangle if it is a triangular based pyramid which is called a tetrahedron.
They are both 3d and they both form triangles on the sides to come up and make a point
Think in 3-dimensions and make a tetrahedron (a triangular pyramid).