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What's the reference angle?
of -330 degrees
I want to say it's 30, but I'm not sure and I don't have my book.
2 Answers
- answerINGLv 61 decade agoFavorite Answer
I usually call it the related angle, but do believe I've heard it called a reference angle.
For -330 degrees you are clockwise 330 degrees from the +x-axis. ALL the trig functions for -330 would correspond to the trig functions for +30 degrees.
[This is not always the case.]
Were you talking of +330 degrees then only the cosine and its reciprocal (secant function) would correspond to the cosine (and secant) of +30; the other 4 functions would be the neg of their reference angle counterparts.
i.e. sin 330 = -sin 30; csc 330 = - csc 30
tan 330 = - tan 30; cot 330 = - cot 30
- Anonymous1 decade ago
Never come across that term before so I had to look it up! Yes you are right - it is the acute angle made with the nearest bit of the x-axis
