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What is the area of a shaded sector if the diameter is 20

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so.. hmm notice the picture below... if the diameter is 20, the radius is half that

thus \(\bf \textit{area of a circle's sector}\\\\ A=\cfrac{\theta\pi r^2}{360}\qquad \begin{cases} r=radius\\ \theta=\textit{angle in degrees} \end{cases}\)

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