Chapter 5 Law of Sines and Cosines

The Story

There are 3 cities in California (knows how to party): City ACity BCity CThe cities on the map make up a triangle. If people want to find and travel the distance between cities,Or the angles on the map, what should they do?

Use the Law of Sines!

= =

==

A

B C

a

bc

Little a is the route airplanes travel on

Little b is the route boats travel

Little c is the route cars travel

A= airport B=bayC= carport

Law of Cosines

a²=b²+c²- 2bc(cosA)Airplane²= boat² + cars²- 2boatcar(Airport)

Airplanes can travel over sea and land, and are better than boats and cars. That’s why they go first.

However, the letters are interchangeable, as long as you keep the same format (ex c²=a²+b²- 2ab(cosC)