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Home > PC3 > Chapter 2 > Lesson 2.2.3 > Problem 2-82


Unit circle, with point in second quadrant labeled, p, segment connecting p to center of circle, and a curved arrow, labeled theta, pointing counterclockwise, from the positive x axis, to the radius.​Examine the diagram at right. If the -coordinate of is , answer the following questions. 

  1. What does equal?

  2. What does equal?

    Added to the unit circle, a right triangle with horizontal leg on the negative, x axis, hypotenuse, labeled 1, is from center of circle to point, P, vertical leg labeled, 0.8.