Using your Head is Permitted

April 2015 solution

This month, Radu-Alexandru Todor not only suggested the riddle, solved it, and wrote up the solution in a way that now allows me to present it with absolutely no editing on my part, he also managed to solve my challenge question, fully characterising all linear relations over the length-sorted edges that any quadrilateral must satisfy.

His solution can be found here.

Enjoy!

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