# Trigonometry. Reference angles

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• Jan 3rd 2010, 09:15 AM
jeunesse27
Trigonometry. Reference angles
Happy new year to you all!
I would greatly appreciate your help with these angles!
Thank you!
Find the reference angle R (theta) if (theta) equals to 6.
a. 18.725033
b. 21.325033
c. 16.225033
d. 19.225033
• Jan 3rd 2010, 09:56 AM
skeeter
Quote:

Originally Posted by jeunesse27
Happy new year to you all!
I would greatly appreciate your help with these angles!
Thank you!
Find the reference angle R (theta) if (theta) equals to 6.
a. 18.725033
b. 21.325033
c. 16.225033
d. 19.225033

Looks like the question is "mixing" radians with degrees.

I assume $\theta = 6$ is in radians, and the given answer choices are in degrees.

are you leaving that information out of the directions?
• Jan 3rd 2010, 10:28 AM
jeunesse27
I was utterly confused myself, though I did copy the question fully from the book.
• Jan 3rd 2010, 11:27 AM
skeeter
reference angle is in quadrant IV and equals $2\pi - 6$

now convert the radian angle $2\pi - 6$ into degrees.