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8 
Cosine Rule find a Side Using the Cosine rule a^{2} = b^{2} + c^{2}  2bcCos(A) to find an unknown side Khan Academy Videos: Pythagoras Iintroduction & Example and problems to practice 
p435 Ex 31.01 p139 
9 
Cosine Rule find an Angle Using the Cosine rule to find an unknown angle in a nonright angle triangle 
p439 Ex 31.03 p140 
10 
Cosine Rule Applications Using the Cosine rule to solve application problems involving finding sides or angles 
p442 Ex 31.05 p141 & 142

Rule Find Angles Find Sides Mouse over key words 
Rule Find Side Mouse over key words 
Rule Working Find Angle Mouse over key words 
Draw triangleWorkingSolutionMouse over key words 