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4 sides, each of which is a isosceles triangle with 3 lines of symmetry, gives 12.
A tetrahedron has 4 faces.
There are 4 vertices does the tetrahedron have
A tetrahedron has four faces.
Square Based PyramidTetrahedron: A tetrahedron is a polyhedron made of 4 triangles. A "regular tetrahedron" is a tetrahedron where the triangles are equilateral. (A polyhedron is any 3 dimentional figure made of flat surfaces and straight lines.)