for some reason this one is funny cant pinpoint error Solve the triangle Law of Cosine chapter a=13 b=5 c=2

Question

-Round one decimal as needed

FInd angle big A

angle big B

angle big C

Should both Law of cosine and sin way to solve be giving a similar enough answer to check yourself? I know it should be a little off rounding ...

Answer 1

For a valid triangle the length of each side should be less than the sum of the lengths of the other two sides. a = 13 is greater than the sum of the lengths of the other sides b = 5 and c = 2 (7).