Unit circle introduction
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Radian to degree formula
(180/π) (because we are trying to divided out pi from the answer) 180÷pi
degree to radian formula
(π/180) (because we are trying to introduce pi to the answer) pi÷180
1 revolution =
2 pi radians or 360 degrees
pi/3
60 degrees
pi/2
90 degrees
a degree
Angles formed by two rays that begin at the same point or share the same endpoint.
a radian
The angle made by taking the radius and wrapping it along the edge of the circle.
negative angle
angle travelling clockwise
coterminal angle
angle with same terminal side after any number of revolutions
45 degrees in radians
pi/4
30 degrees
pi/6
cos θ is the reciprocal of
secant
csc is the reciprocal of
sine
unit circle
circle with radius of 1