###
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^2theta + cos^2theta =

1

###
1 + tan^2theta =

sec^2theta

###
1 + cos^2theta =

csc^2theta

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