Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 7 - Measurement - 7.1 Problem Solving with U.S. Measurement Units - 7.1 Exercises - Page 487: 66

Answer

(a) 283 miles (b) 377 miles

Work Step by Step

(a) We know that the circumference of a circle is given by the formula: $Circumference=\pi~diameter$ We plug in 90 miles for the diameter: $C=\pi *90~miles\approx 283~miles$ (b) We repeat part (a) with 120 miles: $C=\pi *120~miles\approx 377~miles$
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