# Math Help - Sine and cosine rules

1. ## Sine and cosine rules

Hi,
In a triangle where only the sides are given, one uses the cosine rule to find an angle.
However, having done so, is it then possible to use the sine rule to find another angle?
Apologies in advance if the question is dumb.
Thank you and go well.

2. ## Re: Sine and cosine rules

Originally Posted by Seaniboy
Hi,
In a triangle where only the sides are given, one uses the cosine rule to find an angle.
However, having done so, is it then possible to use the sine rule to find another angle?
Apologies in advance if the question is dumb.
Thank you and go well.
You have it correct. An alternative is to keep using the Law of Cosines. But the Law of Sines gets it done nicely.

-Dan

3. ## Re: Sine and cosine rules

Thanks very much, Dan.