Correct, and keep in mind that the law of cosines applies to triangles in general, not just obtuse ones.
I have to solve a triangle
the given information in triangle ABC is c=28.6,b=19.9 and A=48.1^o
i used the cosine law to get a which i found to be 21.3 is this correct?
i then tried to use the cosine law again to find one of the other angles
is this right? i don't think it is because we are working with obtuse triangles