Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 10 - Area - Chapter Review - Page 679: 42

Answer

$4 \pi \ m$

Work Step by Step

In order to get the arc length $l$, we need to multiply the circumference $C$ by $\dfrac{120^{\circ}}{360^{\circ}}$. $C=2\pi r= (2 \pi)(3)=6 \pi \ m$ Further, we have: $l=\dfrac{120^{\circ}}{360^{\circ}} \times 6 \pi=2 \pi \ m$ Next, the area of a circle can be found as: $l=\dfrac{240}{360} \times 6 \pi=4 \pi \ m$
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