Answer
$\approx985.9\text{ ft}$
Work Step by Step
We know that $\tan{\theta}=\frac{\text{opposite}}{\text{adjacent}}$.
We can denote that $\tan{(85.361^o)}=\frac{AC}{80}$, hence $AC=80\tan{(85.361^o)}\approx985.9\text{ ft}$
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