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4.16 Let G be a polyhedron (or polyhedral graph), each of whose faces is bounded by a pentagon or a hexagon. (i) Use Euler's formula to show that G must have at least 12 pentagonal faces. (ii) Prove, in addition, that if Gis such a polyhedron with exactly three faces meeting at each vertex (such as a football), then G has exactly 12 pentagonal faces.

4.16 Let G be a polyhedron (or polyhedral graph), each of whose faces is bounded by a pentagon or a hexagon. (i) Use Euler's formula to show that G must have at least 12 pentagonal faces. (ii) Prove, in addition, that if Gis such a polyhedron with exactly three faces meeting at each vertex (such as a football), then G has exactly 12 pentagonal faces.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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pleae help for 16 and 17 please 

4.16 Let G be a polyhedron (or polyhedral graph), each of whose faces is bounded by a pentagon or a hexagon. (i) Use Euler's formula to show that G must have at least 12 pentagonal faces. (ii) Prove, in addition, that if Gis such a polyhedron with exactly three faces meeting at each vertex (such as a football), then G has exactly 12 pentagonal faces.
Transcribed Image Text:4.16 Let G be a polyhedron (or polyhedral graph), each of whose faces is bounded by a pentagon or a hexagon. (i) Use Euler's formula to show that G must have at least 12 pentagonal faces. (ii) Prove, in addition, that if Gis such a polyhedron with exactly three faces meeting at each vertex (such as a football), then G has exactly 12 pentagonal faces.
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