By: Hannah Popp
Radians: an angle made at the center of the circle by an arc whose length is the same as the radius.
Degrees: a measure of angles
Initial side: The ray where measurements of an angle starts.
Terminal Side: The ray where measurements of an angle stops.
Coterminal Angle: Angles which share a terminal side
Reference Angle: Is the smallest angle between the terminal side and the x-axis
Unit Circle: Circle with a radius of 1
Trig Ratios: Functions used to calculate the missing length of a triangle