find reference angle

Question

111degrees

and

-105

does it equal =75?

i don't know the first one

Answer 1

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.