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I need help finding the reference for these given angles...

(a) 120° (b) -210° (c) 780°

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    do you need help visualizing the above angles?2012-10-29
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    No...I need help finding the reference angles...2012-10-29
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    According to a definition found through Google, "The reference angle is the acute angle formed by the terminal side of the given angle and the x-axis" where the given angle is represented with its first ray along the positive $x$-axis.2012-10-29
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    I would now draw each angle on a polar graph and apply the definition that alex.jordan gave (or whatever one is in your book if different).2012-10-29

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