Asked by Rachal
Find the reference angle for -144 degrees.
I'm coming up with 504 degrees, but I think I'm missing a step.
I'm coming up with 504 degrees, but I think I'm missing a step.
Answers
Answered by
Rachal
I now think its 36 degrees
Answered by
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 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)
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