What is wrong with this picture?


This image illustrating the Pythagorean Theorem was created by the artist Mel Bochner. It appears on the cover of the January 2009 issue of the College Mathematics Journal.

What is wrong with it?

For the answer, visit the 360 blog.



  1. Bert says:

    Very nice. Very common mistake, too – though I hadn’t before seen it in this context.

    1. Very nice indeed—it was the folks at 360 who noticed it. The journal was sitting on my coffee table for a week and I never gave the cover a second look.

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