A tetrahedron.
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A triangular based pyramid with 4 equilateral triangle faces is a tetrahedron
A cube, rectangular prism, or pyramid.
A triangular pyramid is usually called a tetrahedron; its base is an equilateral triangle, as are the other three of its sides. An Egyptian pyramid has a square base; the other four sides are isosceles triangles.
It is a tetrahedron
Triangular Pyramid