Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 3 - Section 3.4 - Arc Length and Area of a Sector - 3.4 Problem Set - Page 155: 47

Answer

$\frac{9\pi}{5}\approx5.65$ m$^{2}$

Work Step by Step

If $\theta$ (in radians) is a central angle in a circle with radius $r$, then the area of the sector formed by angle $\theta$ can be calculated as $A=\frac{1}{2}r^{2}\theta$. We are given that $\theta=\frac{2\pi}{5}$ and $r=3$ m. Therefore, $A=\frac{1}{2}(3^{2})(\frac{2\pi}{5})=\frac{1}{2}(9)(\frac{2\pi}{5})=\frac{1\times9\times2\pi}{2\times5}=\frac{18\pi}{10}=\frac{9\pi}{5}\approx5.65$ m$^{2}$.
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