Area of a Circle

= π r²

Area of a Circular Sector

= ½ rad r²

Radians =

∏/180

 Degrees°=

180/π

lenght of a Circular Arc

=rΘ

Angular Speed (ω)

"θ" in radians

ω = θ÷t

linear Speed (v)

"s" arch lenght

v = s÷t 

or

v = rω

cscθ°

=1/sinθ°

secθ°

=1/cosθ°

cotθ°

=1/tanθ°

or

=cosθ°/sinθ°

1

=sin²θ+cos²θ 

sec²θ

=tan²θ+1

csc²θ

=1+cot²θ

sin(-θ)

=-sinθ

cos(-θ)

=cosθ

tan(-θ)

=-tanθ