Find the Length of the Third Side of the Right $\sqrt{4} \approx 2.000$

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) $\sqrt{4} \approx 2.000$
B) $\sqrt{136} \approx 11.662$
C) $\sqrt{136}=68.0$
D) $\sqrt{586} \approx 24.207$