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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?

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12y ago

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Q: What 3D shape has one trianguar face?
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