Students will develop understanding of the radian measure of an angle, graph trigonometric functions, and derive and apply the Pythagorean identity. Divide Unit Circle by Eight Divide the circle into eight equal parts and label the angle corresponding with each point. The Formula for calculating Radians is: We will calculate the Radians for each degree on the Unit Circle labeled above. Example: Find. In the last point, we’ve established that a full circle has 2π radians. Trig Cheat Sheet Definition of the Trig Functions Right triangle definition For this definition we assume that 0 2 p <