A right triangle has sides of length 1 and 2. Find the length of its hypotenuse $C$.

$C =$

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Note: You may use standard math operations $+ \ - \ * \ / \ \ \mbox{\textasciicircum} \ \ ( \ )$ and standard math functions $\sin(3), \ \cos(pi/6), \ \mathrm{sqrt}(2),$ etc., in your answer. Your answer will be interpreted exactly as if it were entered into a graphing calculator.