Also assuming that those are actually circles
#81: Sangaku
Thursday, 4 December 2008

The puzzle is paraphrased from an old sangaku via a book of puzzles called 1000 Play Thinks, by Ivan Moscovich. After quite a bit of puzzling, N8 and I found out that it’s the only puzzle in the book without an answer in the back! Boy were we pissed. I did find some solutions I totally didn’t understand on the ‘wubs though. The only thing we managed to prove with what we could remember of high school geometry was that two certain line segments must be equal…so! Give it a shot!

2 Comments...

  1. Nate

    I lost another two hours of my life when you posted this. I can’t keep doing this to my balls!

  2. Makin’ faces | FOOLISHCREATURES!

    [...] Remember that Sangaku puzzle from a while back? Well, I received a solution from Thomas Weibull, a mathematician working [...]

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