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.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 5 - Section 5.4 - The Pythagorean Theorem - Exercises - Page 250: 3
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