Elementary Geometry for College Students (5th Edition)

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: 31

Answer

r=3$\frac{1}{3}$

Work Step by Step

semiperimeter=.5(13+13+10) s=18 r=$\frac{2\sqrt {s(s-a)(s-b)(s-c)}}{a+b+c}$ r=$\frac{2\sqrt {18(18-10)(18-13)(18-13)}}{10+13+13}$ r=$\frac{2\sqrt {3600}}{36}$ r=$\frac{120}{36}$ r=3$\frac{1}{3}$
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