SOLUTION: Find the smallest angle of a triangle whose sides are 7, 8, and 9. (solution in radians)

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Question 458117: Find the smallest angle of a triangle whose sides are 7, 8, and 9. (solution in radians)

Answer by Alan3354(69443) About Me  (Show Source):
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Find the smallest angle of a triangle whose sides are 7, 8, and 9. (solution in radians)
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The smallest angle is opposite the shortest side
Use the Cosine Law.
7%5E2+=+8%5E2+%2B+9%5E2+-+2%2A8%2A9%2Acos%28A%29
cos(A) = (64 + 81 - 49)/144 = 96/144
A =~ 0.84107 radians