SOLUTION: This problem refers to triangle ABC. If a = 40 cm, b = 12 cm, and c = 34 cm, find the largest angle. (Round your answer to the nearest whole number.) I've only got 33 so far

Question 1169558: This problem refers to triangle ABC.
If a = 40 cm, b = 12 cm, and c = 34 cm, find the largest angle. (Round your answer to the nearest whole number.)
I've only got 33 so far which was incorrect.
Answer by ikleyn(52800) (Show Source): You can put this solution on YOUR website!
.


The largest angle is opposite to the longest side.


By knowing is, we now can apply the cosine law to find cos(A), where A is the opposite angle to the side a= 40 cm


    a^2 = b^ + c^2 - 2bc*cos(A),


which implies


    cos(A) =  = -0.36765 = 1.9472 radians = 111.63 degrees.    ANSWER

Solved.

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