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3-110.

Below are two of the special angles that are used in the unit circle. Identify the radian measure for each 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 positive y axis, segment from center to point, curved counter clockwise arrow from positive x axis, circling through all axes, continuing through positive y axis a second time, ending at the segment.

  1. Unit circle, point in third 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.

Divide each circle into equal sectors and count them.
Remember that half of a circle is equivalent to radians.

Review problems 3-12 and 3-94.

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