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December 20, 2014

December 20, 2014

Posted by **Victoria** on Tuesday, December 8, 2009 at 5:53pm.

7 pi/6. I subtracted 2 pi from this and got -5pi/6. But the correct answer is pi/6. Whwere did this come from?

- Trig -
**MathMate**, Tuesday, December 8, 2009 at 6:14pmIf you are referring to reference angles, it is the acute angle that makes with the x-axis.

Since it is either 0 or 2π for the positive x-axis, or π for the negative x-axis, 7pi/6 makes π/6 with the negative x-axis, therefore the answer would be &pi/6.

If the question is not about reference angles, then you need to elaborate a little more.

- Trig -
**Christopher M. Boan**, Tuesday, December 8, 2009 at 7:01pmWell in short pie means 180 degrees or 3.14 radians... subtracting 2 pie would be subtracting 360 giving you a co-terminal angle here's how i would've worked the problem

5pie 180 = 150 degrees

6 * pie

that's 30 degrees away from pie or 180

30 2pie = 1pie

pie * 180 6

in short 30 degrees equals 1pie over 6 and that's how far your angle is away from 180 or pie

- Trig -
**Christopher M. Boan**, Tuesday, December 8, 2009 at 7:05pmthe way it posted looks bad so I'm redoing the math with slash signs

5pie/6 * 180/pie = 150

30/pie * 2pie/180 = 1pie/6

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