Sine Law Limitations

[mikexz]

Hi,

I just got back my test and for one of my solutions my teacher said that I couldn't use the sine law because it doesn't work in a triangle with an angle greater than 90 degrees?

sin a/sinb = A/B

Is there a sort of proof for why I can't use sine law on angles greater than 90? Is there any other limitations for sine law and cosine law?

 

[skeeter]

To answer that question and see where you went wrong, it would help if you posted the exact problem and what you did to solve it.

 

[Loren]

There must be some misunderstanding somewhere. The law of sines is applicable to all triangles.