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3-94.

Below are two of the special angles that are used in a unit circle. Identify the radian measure for the angle shown. Remember counter-clockwise angles are positive and clockwise angles are negative.

  1. Unit circle, point in second quadrant, about 1 third of the way from negative x axis, segment from center to point, curved clockwise arrow from positive x axis, to the segment.

  1. Unit circle, point in fourth quadrant, about half way from negative y axis, segment from center to point, curved counter clockwise arrow from positive x axis, to the segment.

Divide each circle into an equal number of parts. Remember that half of the circle is radians.

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