A triangular based pyramid with 4 equilateral triangle faces is a tetrahedron
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pyramid
Triangular Prism, Triangular Pyramid.
If the base of the pyramid is a triangle then all its faces would be triangular in shape.
The height of the triangular face of a pyramid is called the slant height.
A triangular pyramid is a pyramid that has 4 faces where each face is a triangle. Just type it in on www.google.com/images