Initials side: starting point Terminal side: ending point
CCW motion on coordinate plane=positive CW motion= negative
complimentary= pi/2 rads supplimentary= pi/rads
Formula for arc length: central angle= arc length/radius arc length= radius x central angle
ex: A wheel has a .5m radius and rolls 1.5m, how many radians has it turned?
Unit circle: x sq + y sq=1
45,45,90 triangle legs (x+y)=root2/2
30,60,90 triangle legs (x+y)= 1, root3/2
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