Posted by **CJ** on Wednesday, January 12, 2011 at 7:23pm.

Solve △ABC, given a = 4.4, b = 9.1, and c = 5.7. Round your answer to the nearest tenth.

- Trigonometry -
**drwls**, Wednesday, January 12, 2011 at 8:22pm
What do you mean by "solve"? You already have provided the three side lengths.

The three angles A, B, and C can be computed by using the law of cosines.

c^2 = a^2 + b^2 - 2 a *b cos C

cos C = (a^2 + b^2 - c^2)/(2 a b)

and two other rearrangements of the same formula for A and B

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