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Home > PCT > Chapter Ch2 > Lesson 2.3.7 > Problem 2-162

2-162.

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

Special angles are at the , , , or at the  radians.

  1. Unit circle with radius in second quadrant, about 1 third from the positive y axis, curved counter clockwise arrow from positive x axis to the radius.

  1. Unit circle with radius in third quadrant, about 1 third from the negative x axis, curved counter clockwise arrow from positive x axis to the radius.

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