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Anonymous
Euclid discusses the tetrahedron in his Elements of Geometry, around 300 BC, and it is probably much older.
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A tetrahedron has 4 faces.
Yes, a tetrahedron is a triangular pyramid.
There are 4 vertices does the tetrahedron have
All the angles in a tetrahedron are 60 degrees.
A tetrahedron has four faces.