8.5- Law of Sine and Law of Cosine
by Zoe, Snehita, and Clare

Law of Sine

This law is used on ASA, AAS, and SSA triangles.
The formula:

From

"A" represents the angle, and "a" represents the side opposite angle "A

Step-ByExample:

Finding a Side Length

Finding an Angle

Law of Cosine

This law is used on SAS, and SSS triangles.

The Formula:

From

The lowercase letters represent the side lengths and the uppercase letter ("C") represents the angle opposite side "c".

Step-By-Step Example:

Finding a Side Length

Finding an Angle