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6 April, 08:58

Find the reference angle for - 7pi/9

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  1. 6 April, 09:34
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    0° to 90°: reference angle = angle,

    90° to 180°: reference angle = 180° - angle,

    180° to 270°: reference angle = angle - 180°,

    270° to 360°: reference angle = 360° - angle.

    Step-by-step explanation:

    you can use them all but only one matches

    your problem
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