find reference angle
111degrees
and
-105
does it equal =75?
i don't know the first one
111 is in quadrant 2, between 90 and 180
180 - 111 = 69 degrees above -x axis
-105 (360-105 = 255) is in quadrant 3, between 180 and 270 degrees. 255-180 = 75 degrees below -x axis
Always sketch a graph of such problems.