An hexagon or a 6 sided shape
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A pyramid could be constructed from 4 or more triangles.
There can be no closed 3D shape with only one square and 3 triangles.
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?
how many triangles are in a eight sided figure
pyramid