Four.
Four.
Four.
Four.
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a tetrahedron has 3 Right angles
It has twelve angles but all of them need not be acute.
There are four number of faces in a tetrahedron.
A tetrahedron has 4 faces and 4 vertices.A tetrahedron has 4 faces and 4 vertices.A tetrahedron has 4 faces and 4 vertices.A tetrahedron has 4 faces and 4 vertices.
None because a tetrahedron is a triangular based pyramid which has 4 faces, 6 edges and 4 vertices.