-understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle
-use the unit circle to calculate the trigonometric function of quadrantal measurements
-use a trigonometric function to model periodic phenomena with specified amplitude, frequency, and midline
-prove the Pythagorean identity
-use the Pythagorean identity to find values of trigonometric functions given the quadrant of the angle
-graph a sine function
-graph a cosine function