Triangle Formulas
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Law of Cosines (SSS)
cosA= b^2 + c^2 - a^2 / 2bc
Law of Cosines
c²=a²+b²-2abcosC
Law of Sines
sinA/a=sinB/b=sinC/c
When should you use the law of sines?
AAS or ASA. When you are given two angles and 1 side are looking for the other side.
Area of a (non right) triangle
Area= 1/2bcsinA
When should you use the law of cosines?
SSS or when you have 2 sides and an angle and are looking for the third side. Or when you are looking for an angle when you have 3 sides.