Khan/khan-exercises — Issue #14164: Pythagorean theorem 1 - Pythagorean Theorem problem disagrees with my correct answer
Author: KhanBugz
Created: 2012-02-19 03:58:33+00:00
State: open
Labels: firefox, win7, wrong-or-unclear

For the problem in the Pythagorean theorem exercise where there is a right triangle ABC with the vertex of the right angle at c, the hypotenuse AB is length 8 and the side AC is length 3, and so side CB is 53^1/2 (AC^2+CB^2=AB^2 from the theorem, therefore CB^2=8^2-3^2 (64-9), therefore CB^2=53, therefore CB=53^1/2). This is not accepted as the correct answer (written in the system as 53 under the radical symbol), even though 53 is prime and therefore its square root cannot be simplified.

[pythagorean_theorem_1.html?seed=77&problem=find-a-leg](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/pythagorean_theorem_1.html?seed=77&problem=find-a-leg&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/pythagorean_theorem_1.html?seed=77&problem=find-a-leg&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B1%2C53%5D%22%2C33%5D%5D)

[[1,53]]

Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20100101 Firefox/11.0

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