# The Cosine Rule A B C a b c. The Cosine Rule A B C a b c

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The Cosine Rule A B C a b c Slide 2 The Cosine Rule A B C a b c Slide 3 A B C a b c Slide 4 When To Use The Cosine Rule. The Cosine Rule can be used to find a third side of a triangle if you have the other two sides and the angle between them. 6 10 65 o L89 o 13.8 6.2 W 147 o 8 11 M Slide 5 Calculating Sides Using The Cosine Rule(1). Calculate the length AC 30m 55 40m Slide 6 30m 55 40m b a c Slide 7 Slide 8 Calculating Sides Using The Cosine Rule(2). Calculate the length CB 100 13cm 5cm Slide 9 100 13cm 5cm b a c Slide 10 Slide 11 Rearranging the cosine rule. You now have a formula for finding an angle if you know all three sides of the triangle. Slide 12 Calculating Angles Using The Cosine Rule (1). Calculate the angle CAB Slide 13 b a c ? Slide 14 Slide 15 Calculating Angles Using The Cosine Rule (2). Calculate the angle ? Slide 16 B A C b a c Slide 17

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