Question 1057111: Find the radian measure of the largest angle in the triangle with side lengths of 77, 88, and 1313.
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! Find the radian measure of the largest angle in the triangle with side lengths of 77, 88, and 1313.
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I'll assume you mean 7, 8 & 13
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The largest angle is opposite the longest side.
Use the Cosine Law
13^2 = 7^2 + 8^2 - 2*7*8*cos(C)
cos(C) = 56/112 = 0.5
C = pi/3
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