The first of 2 laws specifically for non-right triangles

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The Law of Cosines February 25, 2010.

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Presentation transcript:

The first of 2 laws specifically for non-right triangles 8-1 Law of Cosines The first of 2 laws specifically for non-right triangles

Notice: Non-right Triangles We will be using this law when the information given fits SSS or SAS patterns. Watch the derivation: You don’t have to reproduce it, just be able to follow it.

B c a y x A C b Law of Cosines

B c a A C b

Area Formula B c a y x A C b

Example Solve ΔABC if a = 3, c = 5 and B = 41º. Now, tonight you might be asked to solve for only one thing. On the review sheet and test you will solve for everything. To the homework: drop 11, 24