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A quadrantal angle is one whose initial arm is the positive x-axis and whose terminal arm is on the y-axis or the y-axis.

In other words, it is k(90 degrees), k is an integer.

(in radians: k(pi)/2)

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Q: What is the measure of quadrantal angle?
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A Quadrantal angle is an angle that is not in Quadrant I. Consider angle 120. You want to find cos(120) . 120 lies in quadrant II. Also, 120=180-60. So, it is enough to find cos(60) and put the proper sign. cos(60)=1/2. Cosine is negative in quadrant II, Therefore, cos(120) = -1/2.


What is a quadrantal angle?

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What is the measure of the supplementary angle of an interior angle?

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