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Math Help - Calculate the principle angle?

  1. #1
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    Calculate the principle angle?

    I am having some trouble with this question.

    It says here:

    A point is given on the terminal arm of each angle. Calculate the measure of the principal angle in radians to 1 decimal place.

    a) (2, 3)
    b) (-3, 1)

    How do you figure this out? Thanks!
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by finalfantasy View Post
    I am having some trouble with this question.

    It says here:

    A point is given on the terminal arm of each angle. Calculate the measure of the principal angle in radians to 1 decimal place.

    a) (2, 3)
    b) (-3, 1)

    How do you figure this out? Thanks!
    In a) we are talking about a quadrant I angle, so you solve
    tan ( \theta ) = \frac{3}{2}

    So put your calculator in "radian" mode, and figure out what the angle is.

    -Dan
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