Step 1:

(a)

The value of is .

Find the reference number .

The reference number associated with is the shortest distance along the unit circle between the terminal points determined by and -axis.

Reference number is 

Step 2:

(b)

Find the terminal number.

The point obtained by moving along the unit circle in either clockwise or anti clockwise direction is the terminal distance.  

The reference number is , the terminal point is .

Since lies in third quadrant, both

Terminal point is .

Solution:

(a) Reference number is 

(b) Terminal point is .