11 November 2016

466. From 0 to 7 triangles

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There is not a single triangle in the layout above. However, by just adding 2 matchsticks you could have 7 triangles. How would you do this? All matchsticks don't have to be flat on the surface.

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The 7 triangles are:

ACB
AGD
GFH
CJH
JEF
CEG
BED

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