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Which of the following solids is not a polyhedron?
A polyhedron is called convex when:
Assertion (A): A cylinder is not a polyhedron. Reason (R): All the faces of a polyhedron are polygons.
A polyhedron can have exactly 3 faces.
A square pyramid is a regular polyhedron.
Answer with reasons: (a) Can a polyhedron have exactly 3 triangular faces and no other faces? (b) Can a polyhedron have exactly 4 triangular faces and no other faces? (c) Can a polyhedron have one square face and four triangular faces?
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