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1.Can a polyhedron have for its faces
(i) 3 triangles?

(ii) 4 triangles?

(iii) a square and four triangles?

Answer :

A polyhedron is a solid which is bounded by four or more polygonal faces in such a way that pairs of faces meet along edges and three or more edges meet in each vertex.Therefore,
(i)No because a polyhedron cannot for its faces have three triangles.