You can put this solution on YOUR website! If the cosine of an angle is .4025, find the measure of the angle to the nearest degree.
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Use a calculator
Angle = 66º (the principal angle)
Angle also = 294º
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To be thorough:
Angle = 66 + n*360
Angle = 294 + n*360
n = 0,1,2,3 ...