Trig. ratios and trig expressions

hi so i need help for these Two questions:

1. a) To find trigonometric ratios for 240 degrees using a unit circle, a Reference angle of 6 degrees is used. what reference angle should you use to find the trigonometric ratios for 210 degrees?

b) Use the unit circle to find exact values of the three primary trig. ratios for 210 and 240 degrees

2. A fishing boat is 15km south of a lighthouse. A yacht is 15km west of the same lighthouse.

a) Use trigonometry to find an exact expression for the distance between the two boats.

b) Check your answer using another method.

Any help would be appreciated