UNIT CIRCLE

Reference Angle: the angle between the terminal side and the x-axis
                     ***all reference angles are acute, which means that the can only be from 0-90 degrees

Radians: created when the length of an intercepted arc is equal to the radius of a circle
                     *** 1 radian equals approx. 57.29 degrees
                          2pi radians equals 360 degrees

GRAPHS OF ALL 6 TRIG FUNCTIONS

"The Magic Hexagon"

1. Cofunction Relationships: Left and Right (sine/cosine, tan/cot,...)

2. Reciprocal Relationships: Diagonal (sin/csc, cos/sec,...)

3. Pythagorean Relationships: Shaded Triangles (upper left squared plus upper right squared equals the bottom squared)