unit circle trig + graphing

Unit circle     do you know how to compute the sides of the triangle for -60 degrees?

   here is a good video ....starting at  7:50 into the video

https://www.youtube.com/watch?v=3GgO7Q_kg8Q

       sin -60 = - sqrt3 /2

y = (1) * x^2       a = 1     focus =   (0, 1/4a) = (1 , 1/4 )