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Home > PC3 > Chapter 2 > Lesson 2.3.1 > Problem 2-128


For each angle (in radians) listed below, determine the signs of the coordinates in a unit circle. 

  1. 1. The denominator says the the top half of the circle should be divided into pieces.

    2. The numerator says go to the th piece starting from

    3. This angle is the 2nd quadrant so the signs are for .

  1. Move clockwise from .

  1. Divide half of the circle into pieces. Every pieces is one time around the circle.

  1. intersects the unit circle at the point , so the signs of the coordinates are .