What coordinates on the unit circle are associated with the angle measure?

210°  =    30°  reference angle in the  3rd quadrant.......the coordinates  are  ( -√3/2  ,-1/2)

-7pi /4  =   2pi - 7pi/4 =  8pi /4  - 7pi/4 =  pi / 4 = 45°  ....the coordinates are  (√2/2, √2/2)

34pi/3  = 11pi + pi/3  =  240°   = 60°refernce angle in the 3rd quadrant.....the coordinates are  ( -1/2, -√3/2)