Description: Sal uses the Pythagorean theorem to find the height of a right triangle with a base of 9 and a hypotenuse of 14. Created by Sal Khan and Monterey Institute for Technology and Education. Let me draw my right triangle just like that. And we're told that this side's length right here is 14. And we know that if we have a right triangle, if we know two of the sides, we can always figure out a third side using the Pythagorean theorem.*Teacher Advisor is 100% free.