Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 1 - Section 1.2 - Formulas and Percent - 1.2 Exercises - Page 63: 45


$(a)~r=240$ in $(b)~d=480$ in

Work Step by Step

We know that the circumference of a circle is given by the formula: $Circumference=2\pi~radius$ $C=2\pi r$ We can solve for the radius, $r$: $r=\frac{C}{2\pi}$ We plug in $C=480\pi$ in: $r=\frac{480\pi}{2\pi}$ $r=240$ in (b) We know that the diameter relates to the radius by the formula: $diameter=2*radius$ $d=2r$ We plug in $r=240$: $d=2*240=480$ in
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