Just need a quick recap of certain things. Explanation has to be without the use of a calculator.

Using the unit circle, how do I find the sin and cos of pi/3.

Using the unit circle, how do I find the sin and cos of pi/6.

(I know the two have opposite cos and sin values, I just literally need to know how to get them without the use of a calculator but instead with the unit circle and the triangles.)