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There are an infinite number of possible solutions.

A tetrahedron and icosahedron are regular shapes. Then there is the triangular prism.

A cuboid with one vertex cut off, a cube with 2 vertices cut off, 3 vertices etc. In fact, cutting off the vertex of any polyhedron in which three sides (faces) meet at the vertex will give a new triangular face.

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14y ago

What else can I help you with?