Nov. 2 Class

Today we discussed Cosine Law.  You can use it in three different forms:

All of which are equivalent, so choose whichever you wish depending on the situation.

You can use it to solve for side lengths (a, b, c) or for angles (A, B, C).  Here are a couple of examples I showed in class.

Handouts:

• Cosine Law part 1 
• Cosine Law part 2

Homework: Complete worksheet, P. 299 # 1-12