1 heat 2 oxygen 3 fuel 4 uninhibited chain reaction
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It is the 4 parts of a fire: 1 heat, 2 fuel, 3 air and 4 an uninhibited chain reaction.
A tetrahedron has 4 faces.
There are 4 vertices does the tetrahedron have
A square is a tetragon whereas a tetrahedron is 4 faced pyramid
A triangular based pyramid which is a tetrahedron has 4 faces, 6 edges and 4 vertices