Trig Check my answer Please
posted by Rachal
Find the reference angle for 144 degrees.
I'm coming up with 504 degrees, but I think I'm missing a step.

Rachal
I now think its 36 degrees

Anonymous
Visually it doesn't make sense for an angle to be negative.
However we often measure angles off of some axis, such as the xaxis, and positive angles go around counterclockwise, while negative angles go around clockwise.
Outside of the context of a Cartesian Coordinate system (xy plane), negative angles don't generally make sense but:
144°=360°144°=216°
Trigonometric Identities for negative angles:
sin(A) =  sin(A)
cos(A) = cos(A)
tan(A) =  tan(A)
cot(A) =  cot(A)
csc(A) =  csc(A)
sec(A) = sec(A)
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