# What is the Law of Sines?

##### 1 Answer

Jan 30, 2015

First of all it is useful to say the notation in a triangle:

Opposite at the side

Opposite at the side

Opposite at the side

So, the Sinus Law can be written:

This Law is useful in all the cases SSA and **NOT** in the case SAS, in which the Law of Cosinus has to be used.

E.G.: we know