Can a polyhedron have for its faces

(i) 3 triangles?


(ii) 4 triangles?


(iii) A square and four triangles?


(i) No, such a polyhedron is not possible. A polyhedron has minimum 4 faces


(ii) Yes, a triangular pyramid has 4 triangular faces



(iii) Yes, a square pyramid has a square face and 4 triangular faces



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