# Sines and Cosines

1. Oct 13, 2004

### Poweranimals

Okay, I'm writing a general reply to this statement for my Sines and Cosines report.

The Laws of Sines and Cosines are just trigonometric identities but they are useful for solving triangles when only a portion of them are known.

Thoughts?

How does this sound?

The above statement is true about the two laws. Depending on the angle that you want to find will determine the law you would apply. Either Sine or Cosine. For example: If you know the largest angle, then the remaining angles should be acute. Then we would apply the laws of sines. Now, if you are given two sides and an included angle (SAS) of an oblique triangle, and none of the three ratios in the law of sines are known, then we would use the law of cosines. The above trignometric problems can be tricky, but you have to incorporate the given portions and then work them out from there. It can be fun!!!!