SOLUTION: Find the endpoint of the radius of the unit circle that makes an 870 degree angle with the positive horizontal axis. Help me please, i'm really struggling with this

Algebra ->  Trigonometry-basics -> SOLUTION: Find the endpoint of the radius of the unit circle that makes an 870 degree angle with the positive horizontal axis. Help me please, i'm really struggling with this      Log On


   

Question 961577: Find the endpoint of the radius of the unit circle that makes an 870 degree angle with the positive horizontal axis.
Help me please, i'm really struggling with this
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Every 360 degrees, you're back to where you start so at 720 degrees (2 revolutions), you're back the the x-axis (0 degrees).
Adding another 150 degrees gives you a total of
720%2B150=870.
So you are at 150 degrees counterclockwise from the positive x axis.
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x=cos%28150%29=-sqrt%283%29%2F2
y=sin%28150%29=1%2F2