Learn about the Law of Cosines used to solve non-right triangles. Explore how it complements the Law of Sines for triangle trigonometry problems. Discover how to apply the Law of Cosines effectively.
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Presentation Transcript
Section 5.7
The Law of Cosines
The Law of Cosines Like the Law of Sines, we use this to solve triangles that are not right triangles (no 90° angles). The Law of Cosines can help to solve triangles that the Law of Sines can not solve.
Law of Cosines (cont.) These all represent the same law, just different ways of showing it…
Example Solve ΔABC if A = 52°, b = 6 and c = 8.
Example #2 Solve ΔABC if a = 21, b = 16.7 and c = 10.3.