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Home > PC > Chapter 4 > Lesson 4.2.2 > Problem 4-87


Given and is in Quadrant III (), find the following values. Try drawing a triangle where and find the missing side. Next determine if the value you are finding is positive or negative based on the location of the angle.

  1. What must the signs be for
    the coordinates in Quadrant III?

    Circle with point in third quadrant, about 2 thirds from negative x axis, right triangle with hypotenuse from point to center, vertical leg labeled negative 3, horizontal leg labeled negative square root of 7, central angle from positive x axis to radius, labeled beta.

    Find the missing side. Note: The hypotenuse is always .
    Find the .

  1. Follow a similar thinking process as in (a).