Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 8 - Section 8.4 - Circumference and Area of a Circle - Exercises - Page 383: 8b


radius = 2.5 ft circumference = 5$\pi$ ft

Work Step by Step

The area of the circle = 6.25$\pi ft^{2}$ The area A of a circle whose radius has length r is given by A = $\pi r^{2}$ 6.25$\pi$ = $\pi r^{2}$ 6.25 = $r^{2}$ r = 2.5 ft We know the circumference of the circle is given by the formula c= $\pi$ d = 2$\pi$ r = 2$\pi$ * 2.5 = 5$\pi$ ft
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