Find the reference angle for -144 degrees.
I'm coming up with 504 degrees, but I think I'm missing a step.
2 answers
I now think its 36 degrees
Visually it doesn't make sense for an angle to be negative.
However we often measure angles off of some axis, such as the x-axis, and positive angles go around counter-clockwise, while negative angles go around clockwise.
Outside of the context of a Cartesian Coordinate system (x-y 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)
However we often measure angles off of some axis, such as the x-axis, and positive angles go around counter-clockwise, while negative angles go around clockwise.
Outside of the context of a Cartesian Coordinate system (x-y 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)
4 answers