#### Answer

$4\sqrt{3}$

#### Work Step by Step

We use the theorems in the chapter to obtain:
$(CD+ED)CD = FC^2 \\ FC= \sqrt{(8+4)(4)}=\sqrt{48} = 4\sqrt{3}$

Published by
Cengage

ISBN 10:
978-1-337-61408-5

ISBN 13:
978-1-33761-408-5

$4\sqrt{3}$

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