Answer
r=3
Work Step by Step
These 3 sides form a pythagorean triple so this is a right triangle.
r=$\frac{ab}{a+b+c}$
r=$\frac{168}{56}$
r=3
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 8 - Section 8.5 - More Area Relationships in the Circle - Exercises - Page 380: 39a
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