Many thanks
to RM Mentock, Eric, yount, Jukka-Pekka Ikaheimonen, George Huber, Andrej
Jakobcic, Ken Duisenberg, Peter B Wells, Juha Saukkola, Dave Tuller, Warren
Porter, Gregg Middleton, and Jeffrey Harris for sending solutions.

The hypotenuse of the 12 inch isoceles right triangle has a length of
sqrt(12^2 + 12^2) = sqrt(288), which is not equal to 17 = sqrt(289).