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A Polygon Has a Radius?

GMAT-QHZCMC

A regular pentagon has a side whose length is $10 \text{ feet}$ and an apothem whose length is $6.9\text{ feet}$.

Gustavb. A Regular Polygon. Digital image. Wiki Media Commons. Created by Gustavb Using Gustavb/regular Polygon.pl, n.d. Web.

What is the length of its radius?

A

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

B

$\cfrac{\sqrt{7261}}{10}\text{ feet}$

C

$\sqrt{7261}\text{ feet}$

D

$\cfrac{\sqrt{7361}}{10}\text{ feet}$

E

$\sqrt{7361}\text{ feet}$