College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 2 - Functions and Graphs - Exercise Set 2.8 - Page 321: 96

Answer

$11\pi$

Work Step by Step

Given the circles $$(x-2)^2+(y+3)^2=25$$ $$(x-2)^2+(y+3)^2=36$$ we notice that both circles are centered at $(2,-3)$, and their radii are $r_{1}=\sqrt{25}=5$, $r_{2}=\sqrt{36}=6$ The area of a circle is given by the formula $\pi r^2$. The area of circle $1$ is, $\pi r_{1}^2=25\pi$ and the area of circle $2$ is, $\pi r_{2}^2=36\pi$. The area between the two circles is the area of the donut-shaped region: $$36\pi-25\pi==11\pi.$$
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