SOLUTION: What is the approximate measure of angle C in a triangle with a = 21, b = 14, and c = 28?
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Question 474554: What is the approximate measure of angle C in a triangle with a = 21, b = 14, and c = 28?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
first let's use law of cosines
The inverse function of cosine.
Basic idea: To find cos-1 (-0.25), we ask "what angle has cosine equal to -0.25?"
The answer is:
°
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