What are convex and concave polyhedron??
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A polyhedron is said to be convex, if the line segment joining any two points of the polyhedron is contained in the interior and surface of the polyhedron. A polyhedron is said to be concave, if the line segment joining any two points of the polyhedron is not contained in the interior and surface of the polyhedron.
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Concave Polyhedron: A concave polyhedron is a polyhedron with the property that there exist two points inside it such that the line segment drawn between them contains points not in the polyhedron. In other words, a polyhedron is concave exactly when it is not convex.
Convex Polyhedron:a polyhedron any plane section of which is a convex polygon.
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