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The Cosine Rule

The Cosine Rule. Angle A is opposite side a. Angle B is opposite side b. Angle C is opposite side c. Draw any triangle. Measure sides and angles. Test this rule out!. Your objective is to prove the Cosine Rule!.

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The Cosine Rule

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  1. The Cosine Rule Angle A is opposite side a. Angle B is opposite side b. Angle C is opposite side c. Draw any triangle. Measure sides and angles. Test this rule out!

  2. Your objective is to prove the Cosine Rule! On your worksheet there are eight statements/diagrams – these are the key elements of your proof. Your task is to use the elements to create a proof of the Cosine Rule. You should explain each step of your proof. You may create elements of your own. You may choose not to use some of the elements. Create a poster of your proof!

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