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What reference angle in the first quadrant corresponds to =–120? Answer in radians.
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What reference angle in the first quadrant corresponds to =–120? Answer in radians.

User Sean Lindo
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If you know that pu radians is 180 degrees, then all you need to do is take 180-(-120)=300. To 360, you get the terminal angle to be 60. 60/180=1/3, so the answer is 1/3pi radians
User Jim Blum
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