Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 8 - Section 8.4 - Circumference and Area of a Circle - Exercises - Page 384: 8b

Answer

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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