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Problem 339: (2009 AMC12B, 20)
A convex polyhedron $Q$ has vertices $V_1,V_2,\ldots,V_n$, and $100$ edges. The polyhedron is cut by planes $P_1,P_2,\ldots,P_n$ in such a way that plane $P_k$ cuts only those edges that meet at vertex $V_k$. In addition, no two planes intersect inside or on $Q$. The cuts produce $n$ pyramids and a new polyhedron $R$. How many edges does $R$ have? $\textbf{(A)}\ 200\qquad$ $ \textbf{(B)}\ 2n\qquad$ $ \textbf{(C)}\ 300\qquad$ $ \textbf{(D)}\ 400\qquad$ $ \textbf{(E)}\ 4n$
Solution
Exercise 339: Solution
A convex polyhedron has $14$ vertices and $24$ edges. Each vertex is cut off by a plane that meets only the edges at that vertex, and no two of the cutting planes meet inside or on the polyhedron. How many faces does the resulting polyhedron have?
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