If one leg of a right triangle has length 21 and the hypotenuse has length 53, what is the length of the other leg?

Use the Pythagorean theorem. a^2 + b^2 = c^2 So you already know one of the legs (we'll call it 'a') is 21. And the hypotenuse (this is 'c') is 53. Substitute these values into the theorem. 21^2 + b^2 = 53^2 441 + b^2 = 2,809 b^2 = 2,368 b = the square root of 2,368. This simplifies to 8 * the square root of 37. This is approximately 48.66.

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