Find the Length of the Third Side of the Right $\sqrt{500} \approx 22.361$

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.
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A) $\sqrt{500} \approx 22.361$
B) $\sqrt{500}=250.0$
C) 500
D) $\sqrt{30} \approx 5.477$