Proving a certain parameterization gives the unit circle and showing vector equations of lines are parallel

Defining radians for angle measure using the corresponding arc length on a unit circle

Discussing the degree and radian measure of special angles on the unit circle

The coordinates for the quadrantal angles on the unit circle

Finding the coordinates on the unit circle for the common angles in the first quadrant

Finding the coordinates on the unit circle for all the common angles

Finding the values of trig functions with the unit circle

Finding the exact value of tangent for several given angles using the unit circle

Finding the exact value of secant, cosecant, and cotangent using the unit circle