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A regular pentagon has a side whose length is $10\text{ feet}$ and a radius whose length is $8.5\text{ feet}$.

BCampbell Created for Albert.io. Copyright 2016. All rights reserved

What is the length of its apothem?

A

$\cfrac{189}{4}\text{ feet}$

B

$\cfrac{\sqrt{189}}{2}\text{ feet}$

C

$\cfrac{\sqrt{389}}{2}\text{ feet}$

D

$\cfrac{389}{4}\text{ feet}$

E

None of the answers above is correct.

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