the actual answer would be a geometrical triangular pyramid
* * * * *
which is a tetrahedron.
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i didnt really understand this question...but i believe what your trying to ask, which shape has 4 trianglular faces? and my answer is the pyramid i hope that is the answer your looking for.
However, a pyramid as in Egypt, has a square base. The proper name for the shape with four triangular sides is a tetrahedron.
The solid shape that has one square face and four triangular faces is called a pyramid. If you were to have a shape that had four triangular faces and no square face, it would be called a triangular pyramid.
triangular face shape
A square based pyramid.
A triangular prisim (3 faces on sides, one face on bottom).
An octagon is a plane shape with just one face - an octagonal face! It cannot have triangular faces.