Crossword Genius

Element of the Pythagorean theorem (10)

Ross

I believe the answer is:

hypotenuse

(Other definitions for hypotenuse that I've seen before include "Long side of right-angled triangle" , "Side opposite right angle" , "Longest side of right-angled triangle" , "geometrician's line" , "Subject of 1 across's theorem" .)

I've seen this clue in the LA Times.
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