Answer
$6.6$ cm
Work Step by Step
$\cos50=\frac{r}{10.2}$
$10.2\times\cos50=r$
$r\approx6.6$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 11 - Section 11.2 - The Cosine Ratio and Applications - Exercises - Page 512: 38a
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