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Home > A2C > Chapter 8 > Lesson 8.1.5 > Problem 8-79


Calculate each of the following values. Express your answers both exactly and as decimal approximations.


    Draw a unit circle and locate  radians.

    Remember that a full circle as radians and a half circle has radians.

    How many degrees is equivalent to  radians?

    Draw a right triangle and use the special triangle relationship to find the exact value.



    Since  is equivalent to  of  is .
    What is  of ? Locate   on the unit circle.

    Draw a right triangle.
    Notice that is your reference angle.
    Use the relationship to find the exact value.