Answer
r$\approx$2.24
Work Step by Step
s=.5(7+9+12)=14
r=$\frac{2\sqrt {s(s-a)(s-b)(s-c)}}{a+b+c}$
r=$\frac{2\sqrt {14(14-7)(14-9)(14-12)}}{7+9+12}$
r=$\frac{2\sqrt {980}}{28}$
r$\approx$2.24
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: 34b
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