Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Prerequisites - P.4 - Factoring Polynomials - Exercises - Page 40: 81



Work Step by Step

Area of the outer circle with radius r+2 = $\pi(r+2)^2$ Area of the inner circle with radius r = $\pi(r)^2$ Subtract the area of the smaller circle from the area of the bigger circle to get the area of the shaded portion = $\pi(r+2)^2-$$\pi(r)^2$=$4r\pi+4\pi$
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