Radians & Degrees/ Unit Circle

Initial- starting point
Terminal- ending point

Complimentary- pi rads/2 (equals 90)
Supplementary- pi rads (equals 180)

Clockwise motion on a coordinate plain = negative
Counterclockwise " "= positive

Formula for arc length: theta= s/r
- theta= central angle in rads
- s= arc length
- r= radius

UNIT CIRCLE
Conforms to this x^2+ y^2= r^2 OR x^2+y^2= 1 (implies radius= 1 unit long)