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I need help with this question ASAP please.

I need help with this question ASAP please.-example-1
User Richard T
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arc \ length = 2\pi r (\theta)/(360) = \\\\
2 \pi *9 * (135)/(360) =21.205


(3\pi )/(4) =(3*180)/(4)=135

User Jerinaw
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