Find the Length of the Third Side of the Right $\sqrt{108} \approx 10.392$

Multiple Choice

Find the length of the third side of the right triangle. Where appropriate, give both an exact answer and an approximation to three decimal places.
-

A) $\sqrt{108} \approx 10.392$
B) 6
C) $\sqrt{72} \approx 8.485$
D) 12