Answer:
The answer is negative -12.18
Step-by-step explanation:
I would convert to degrees first seems to make it easier.

×

= -468
by adding 360 twice we get the coterminal angle 252
252 is in the 3rd quadrant so 180 is the closest angle on the x-axis
ref angle = 252 - 180 = 72
If necessary convert back to radians...
The answers are as follows:
1-D
2-B
3-C
4-A