Tetrahedron or Triangular Pyramid
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The simplest such shape is PYRAMID.
square based pyramid
A tetrahedron.
Yes. for example to make a pyramid, you need 4 triangles and a square
Well, any shape with a triangular face. I assume that you mean a shape that only has (identical) triangles for faces. There are 2: the tetrahedron with 4 triangles, and the icosahedron with 20 triangles. * * * * * What about a triangular dipyramid? Two triangular pyramids stuck together along one face?