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# Geometric Mean

ACTMAT-VI1O2F

What is the measure of ${ \overline { BD} }$ in the figure below?

A

$\text{6 cm}$

B

$\text{6.5 cm}$

C

$\text{7.21 cm}$

D

$\text{9.85 cm}$

E

$\text{10.82 cm}$