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Euler's Formula
Euler's formula for connected planar graphs - Mathematics Stack Exchange
Lecture 11 – Planar Graphs & Euler's Formula – Math 3012 Open Resources
Dual graph - Wikipedia
Euler's Formula
SOLVED: Prove that the converse of theorem 1.33 (If G is a planar graph with n ≥ 3 vertices and q edges, then q ≤ 3n − 6. Furthermore, if equality holds,