<PRE><B>Question 972316</B>
Is -11pi/4 in the third quadrant? 
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-11pi/4 = -8pi/4 - 3pi/4 = -3pi/4  is in QIII
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And would the reference angle be 15pi/4? Thanks
No.  The reference angle is always an acute angle in QI
It is the acute angle between the given angle and
the closest part of the x-axis.
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The reference angle is pi/4
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Cheers,
Stan H.
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