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Can a polyhedron have for its faces(i)  ...

Can a polyhedron have for its faces(i)        3 triangles?(ii)       4 triangles?(iii)       a square and four triangles?

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The correct Answer is:
1) no, minimum 4 faces 2) Yes, 3) Yes.
1) no, minimum 4 faces 2) Yes, 3) Yes.
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