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What is the hypotenuse of rt.^ABC?

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Cheahjimmyviz
in a right triangle ABC
      c² = a²+b²        >    c = hypotenuse
                                     a & b are the length of the other two legs
     thus
             c =  √(a²+b²)
ex:    if      a = 3  & b = 4
then      c =√(3² + 4²)
                 =√(9+16)
                 = 5