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Law of Cosines Herons Formula Determining b/w Sine & Cosine December 12 th, 2013 December 13 th, 2013

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Heron’s Formula Click the triangle!

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Heron’s Formula

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Example- Find the area

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Law of Cosines/Cosine Rule

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Examples

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Using Sine & Cosine Rules

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Example

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Example- Use Law of Cosines!

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Laws of Sine/Cosine Packet Review the formulas for Law of Sines/Cosines & when you use them For 1-10 set up the problems using BOTH law of sines/cosines, then determine which you should use to solve Solve 11-16 (pick which to use first) 2 pts Extra Credit on test for each challenge question you get right

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Homework Finish the packet A day Edition 2 Pg. 415 #1-3, 4B Pg. 420 #1 and #3 B day Edition 1 Pg. 340 #1-3, 4B Pg. 344-345 #1 and #3

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Credit revision Q 1 What is the sine rule ?. Credit revision Q 2 What three processes do you go through in order to factorise a quadratic ?

Credit revision Q 1 What is the sine rule ?. Credit revision Q 2 What three processes do you go through in order to factorise a quadratic ?

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