Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 8 - Section 8.3 - Regular Polygons and Area - Exercises - Page 366: 7


r$\approx$11.5 cm

Work Step by Step

s=2$\frac{a}{\sqrt 3}$ s=$\frac{20\sqrt 3}{3}$ r=2(.5s) r=s r=$\frac{20\sqrt 3}{3}$ r$\approx$11.5 cm
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