Sunday, 29 December 2013

geometry - Find smallest rectangle divided into figures so each figure has 5 neighbours


The following 3x4 rectangle can be cut into pieces along grid lines, so that each piece has exactly three neighbors:




Problem: Find the smallest rectangle on the integer grid that can be cut into pieces along grid lines, so that each piece has exactly five neighbors.



Pieces are neighbors, if their boundaries touch; touching in a corner doesn't count.




Answer



How's this?


enter image description here


I got this by square-izing the icosahedron graph:



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