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The square of the hypotenuse (c - the side opposite the right angle) is equal to the sum of the squares of the other two sides (a and b) of a right triangle.

Choose, if you would like to find A, B or C and insert the other two values!

$$a^{2}+b^{2}=c^{2}\Leftrightarrow c= \sqrt{a^{2}+b^{2}}$$