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I have a test and this is practice and I don't understand this at all

I have a test and this is practice and I don't understand this at all-example-1

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For the last on you need to set up a proportion with the degrees. You know the arcs add to 360 and that small section is 120 so you set it equal to x over the entire area. X is the answer. The formulas are next to all answers
I have a test and this is practice and I don't understand this at all-example-1
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