#### Answer

Since they are similar triangles, corresponding sides are proportional. Thus:
$\frac{RS}{RV} = \frac{RT}{RS} \\ RV\cdot RT = RS \cdot RS$
Thus, we see that RS is the geometric mean.

Published by
Brooks Cole

ISBN 10:
1439047901

ISBN 13:
978-1-43904-790-3

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