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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.
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Continue Learning about Trigonometry
If an angle measures 245 what is the name of the angle?
obtuse angle
If an angle measure 270 degrees what kind of angle is it?
That's a reflex angle. 0 to <90 Acute angle 90 Right angle >90 to <180 Obtuse angle 180 Straight angle >180 to <360 Reflex angle 360 called Full circle
Which type of angle has a 133 degree?
An obtuse angle.
What is a 213 degree angle?
An angle of 213 degrees is a reflex angle
What is trigonometric angle?
just an angle, like any other angle.
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