The Unit Circle

 The Unit Circle is a circle with a radius of 1. And a circumference of

 

The circumference comes from

 

 

Since the radius is 1, then

 

 

Important Angles:

 

 

 





 

The Unit Circle

 

 

 Helpful Links: http://www.youtube.com/watch?v=3GgO7Q_kg8Q
                         http://www.mathsisfun.com/geometry/unit-circle.html