# Find the end point

• Oct 30th 2012, 02:29 PM
Eraser147
Find the end point
Find the endpoint of the radius of the unit circle that makes a 135 degree angle with the positive horizontal axis. I drew a triangle but I am not quite sure what to do. I have 180 degrees - 135 degrees and ended up with 45 degrees. So in that triangle that I drew inside the circle it will have 45 degrees, and then how would I find the end point that that degree?
• Oct 30th 2012, 03:03 PM
skeeter
Re: Find the end point
Quote:

Originally Posted by Eraser147
Find the endpoint of the radius of the unit circle that makes a 135 degree angle with the positive horizontal axis. I drew a triangle but I am not quite sure what to do. I have 180 degrees - 135 degrees and ended up with 45 degrees. So in that triangle that I drew inside the circle it will have 45 degrees, and then how would I find the end point that that degree?

what do you mean by the "endpoint" ? where the ray intersects the unit circle? if so ...

$x = \cos(135^\circ) = -\frac{1}{\sqrt{2}}$

$y = \sin(135^\circ) = \frac{1}{\sqrt{2}}$