From this triangle, we determined that:
sin A= y/c, therefore y= c * sin A
cos A= x/c, therefore x= c * cos A
From this information, we derived the law of cosines to be used with side-angle-side (SAS).
Finally, we learn the law of cosines for SAS:
Also, you can use this to find out b and c as well.
You can also use law of cosines with side-side-side (SSS).
We also learned about Heron's formula to figure out area. SSS is needed for this.
In Heron's formula, s is derived from the term "semi-perimeter" or half the perimeter. You determine s by:
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