Use the given information and a calculator to find to the nearest tenth of a degree
cos O = -0.3646 with in QIII

111.4 degrees

Step-by-step explanation:

Let's write cos x = -0.3646.  Or, look up the symbols chart at the bottom of your page and click on Ф to obtain this character:  cos Ф = -0.3646.

If Ф is in Quadrant III, then the adjacent side is negative and the hypotenuse is positive.  

                                                         -1

Type this into your calculator:  cos     -0.3646.  Result:  1.934 (radians)

This converts to degrees as follows:

1.934 rad      180 degr

* = 111.4 degrees.  Note that this angle is in QIII.

        1              π rad

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step-by-step explanation:

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