We can use pythagoras' theorem to solve this. Make the shortest side, (A), the next longest side (B) and the longest side (C). Then square all the measurements : A2 + B2 = C2. So the length of C will be given to you in a squared number, so simply use the square root of that number for the length. You can then rearrange the formula to get the length of the side you want, if you're not looking for C.
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