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You use the law of Pythagoras: a2 + b2 = c2, where a and be are the sides adjacent to the right angle, and c is the side opposite. Replace the two sides that you know, and solve for the third one.

Pythagoras: hypotenuse squared = sum of squares of other two sides.

If you know two of the sides you can calculate the third as above.

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Q: How do you find the missing length of a right angle triangle?
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