Find the Exact Value of an Angle

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Determine the exact angle of the blue arc, .


Some points on the circle are marked that have an integer radian measure. Recall that adding any multiple of to an angle measure yields the same point on the unit circle. Red lines highlight a symmetry that may help determine the blue angle.


Contributed by: Izidor Hafner (November 2011)
Open content licensed under CC BY-NC-SA



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