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Planar graph (graph theory)

  1. Sep 6, 2011 #1
    i need some hints on how to do this problem

    If a connected planar graph with n vertices all of degree 4 has 10 regions, determine n
  2. jcsd
  3. Sep 6, 2011 #2
    Use Euler's formula: v-e+f=2. The problem is to find e (the number of edges). Here you must connect the degree of each vertex with the total number of edges...
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