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If you know you are dealing with a right triangle, then you already know that one of the angles is 90°. Since the angles must add up to 180°, you can solve for the missing angle using the formula 90 + X = 180. Once you have all 3 angles, you can use that information and the known length of 1 side to use the law of sines and find the length of the hypotenuse.
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