Find the Missing Length in the Right Triangle $8.5 \mathrm { mi }$

Multiple Choice

Find the missing length in the right triangle. If necessary, round to the nearest tenth.
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A) $8.5 \mathrm { mi }$
B) $42.5 \mathrm { mi }$
C) $9.2 \mathrm { mi }$
D) $85 \mathrm { mi }$