From the figure angle =.

  To find positive angle, subtract to obtain a co-terminal angle

  - =

  To find negative angle, add   to obtain a co-terminal angle

The solution is positive angle is and negative angle is .

 From the figure angle =.

  To find positive angle, subtract to obtain a co - terminal angle

  - =.

  To find negative angle, add to obtain a co - terminal angle

  + =.

The positive angle is and the negative angle is .