Answer
r=3
Work Step by Step
These three numbers form a pythagorean triple so this is a right triangle.
r=$\frac{ab}{a+b+c}$
r=$\frac{120}{8+15+17}$
r=$\frac{120}{40}$
r=3
r=$\frac{2\sqrt {s(s-a)(s-b)(s-c)}}{a+b+c}$
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 8 - Section 8.5 - More Area Relationships in the Circle - Exercises - Page 392: 34a
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