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

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