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find coterminal to radian

2(pi)/1

convert deg to rad

multiply by (pi)/180deg

convert rad to deg

multiply by 180deg/(pi)

length of a circular arc

s= theta(r)

area of a segment

a=1/2r^2theta

radians =

arc length/radius s/r

sin

opp/hyp

cos

adj/hyp

tan

opp/adj sin/cos

cot

cos/sin

sin 30deg

1/2

cos 30deg

sqrt3/2

tan 30deg

sqrt3/3

sin 45deg

sqrt2/2

cos 45deg

sqrt2/2

tan 45deg

1

sin 60deg

sqrt3/2

cos 60deg

1/2

tan 60deg

sqrt3

sin^2theta + cos^2theta =

1

1 + tan^2theta =

sec^2theta

1 + cos^2theta =

csc^2theta

costheta =

x/r

sintheta =

y/r

tantheta =

y/x

r =

sqrt x^2 + y^2

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