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The Law of Cosines February 25, 2010. Solving Oblique Triangles Solving a triangle means finding the lengths of all the sides and the measures of all.

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Presentation on theme: "The Law of Cosines February 25, 2010. Solving Oblique Triangles Solving a triangle means finding the lengths of all the sides and the measures of all."— Presentation transcript:

1 The Law of Cosines February 25, 2010

2 Solving Oblique Triangles Solving a triangle means finding the lengths of all the sides and the measures of all the angles. This problem requires that we know three of the sides or angles.

3 The Law of Sines We use the Law of Sines if we know: Two angles and any side (AAS or ASA) One angle and two sides, where one of the sides is opposite the known angle (SSA)

4 Law of Cosines We use the Law of Cosines if we know: One angle and its two adjacent sides (SAS) All three sides (SSS)

5 Questions What about AAA? On page 612, why are there Alternative Forms of the Law of Cosines? Do we really need three equations for the Law of Cosines?

6 Homework Page 617, 1 – 7 (odd)


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