# Unit Circles

Unit Circle: Defining the trigonometric functions sine and cosine for all real numbers

1.  $\rhd$ Unit circle definition of trig functions (9:03)How to extend SOH-CAH-TOA to define trigonometric functions (sine, cosine, and tangent) for all real numbers.
2.   $\rhd$  The trig functions and right angle trig ratios (6:57)
Pause the video and work it out on your own!Sal shows how, for acute angles, the two different definitions of the trigonometric values (SOH-CAH-TOA and the unit circle definition) result in the same values.