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


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