Determine 2 positive and 2 negative principal angles for a terminal arm with a related acute angle of 20° in quadrant III.

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- January 17th 2009, 07:08 AMwilliamtrig 1
Determine 2 positive and 2 negative principal angles for a terminal arm with a related acute angle of 20° in quadrant III.

- January 17th 2009, 10:02 AMstapel
A "positive" angle will be one for which you went around the unit circle anti-clockwise. A "negative" angle will be one for which you went backward around the circle, or clock-wise.

What is your book's definition of a "principal angle" as related to an angle of the sort provided by this exercise? When you reply, please include a clear listing of your work and reasoning so far.

Thank you! :D - January 17th 2009, 05:06 PMwilliam