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Uses the cosine sum formula and the cosine double angle formula.

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Proving using formulas from unit 4.

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Solving for the area of a triangle

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using the law of sines

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using the law of cosines

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When naming different parts of a triangle....

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When naming different parts of a triangle....

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- use Upper Case letters for the angles of a triangle
- use Lower Case letters for the sides of triangle
- Make sure that the letters of the sides correlate with the opposite angles (shown below)

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How will the unit 4 formulas be used in future units? We used the pythagorean identities for unit 4 so will formulas like the double angle formula be important in future units in the same way?

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How will the unit 4 formulas be used in future units? We used the pythagorean identities for unit 4 so will formulas like the double angle formula be important in future units in the same way?

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I used to think that you could only find the area of if you had the hight and base of the triangle. Now I know you can find the area of a triangle if you have 2 side lengths of a triangle and the angle between them.

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I used to think that you could only find the area of if you had the hight and base of the triangle. Now I know you can find the area of a triangle if you have 2 side lengths of a triangle and the angle between them.

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I used to think that in order to find a missing side of the triangle I needed to use the Pythagorean Theorem, however, now I think and know that you can solve either a missing side or angle of a triangle by using the law of sines or cosines, depending on what is given to you in a problem. 

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I used to think that in order to find a missing side of the triangle I needed to use the Pythagorean Theorem, however, now I think and know that you can solve either a missing side or angle of a triangle by using the law of sines or cosines, depending on what is given to you in a problem. 

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How can we begin to memorize the double angle formulas and where are they derived from?

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How can we begin to memorize the double angle formulas and where are they derived from?

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Having learned the Pythagorean Theorem in geometry enabled us to understand that we can use both the Law of Sines and Law of Cosines in order to find the different parts of a triangle.

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Having learned the Pythagorean Theorem in geometry enabled us to understand that we can use both the Law of Sines and Law of Cosines in order to find the different parts of a triangle.

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I used to think if there was an equation that said cos 2x or sin2x that you could just divide by 2 for both sides. Now i know that you should use the double angle formulas to move forward in the problem.

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I used to think if there was an equation that said cos 2x or sin2x that you could just divide by 2 for both sides. Now i know that you should use the double angle formulas to move forward in the problem.