Sine and Cosine Rule
Sine Rule
When using the sine rule there are always two possible angles the acute and obtuse. Make sure you right down both. The obtuse angle is found by (180 - θacute)
Need an opposite side and angle plus either another angle or side
Need an opposite side and angle plus either another angle or side
Cosine Rule
Area of a non-right angled triangle
ab sinC = A
2
Need two sides and their trapped angle