SOLUTION: The sides of a triangle are 2cm, 3cm, and 4cm. Determine the measurement of the angle opposite the longest side.

Algebra ->  Trigonometry-basics -> SOLUTION: The sides of a triangle are 2cm, 3cm, and 4cm. Determine the measurement of the angle opposite the longest side.       Log On


   

Question 438295: The sides of a triangle are 2cm, 3cm, and 4cm. Determine the measurement of the angle opposite the longest side.
Answer by Alan3354(69443) About Me  (Show Source):
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Use the Cosine Law.
4%5E2+=+2%5E2+%2B+3%5E2+-+2%2A2%2A3%2Acos%28A%29
Solve for cos(A)