A pyramid.
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Only one; a triangle is a 2D shape, not a 3D shape. Usually only 3D (or more) shapes are considered to have 'faces'.
There is no such thing as a 3d triangle. A 3d shape which has only equilateral triangular faces can be a tetrahedron which has 4 faces or an icosahedron which has 20.
triangle
no stupid because one has got faces(3d) and the other has sides(2d)
triangle * * * * * A triangle is NOT a 3d shape! A cube.