# Trig Word Definitions

Radians - a unit for measuring angles

Degrees - a unit of angle measure equal to a 1/360 of a complete revolution

Initial Side - the ray where measurement of an angle starts

Terminal Side - the ray where measurement of an angle stops

Coterminal Angle - angles that share a terminal side

Reference Angle - for any given angle, the reference angle is an acute version of that angle

Unit Circle - the circle with radius 1 which is centered at the origin on the x-y plane

Trig Ratios (Sine, Cosine, Tangent, Secant, Cosecant, Cotangent)