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Warm Up

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Angles of Depression/Elevation Law of Sines & Area of a A December 10 th, 2013 B December 11 th, 2013

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Angles of Elevation/Depression

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Example

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Area of a Triangle w/ Height

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How to Label the Sides/Angles

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The Area of a Triangle Formula

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Example

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Law of Sines / The Sine Rule

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So when do I use law of sines and when do I use trig ratios? Use basic trig ratios and equations for RIGHT TRIANGLES ONLY! Law of Sines can be used when not a right triangle and given:

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Law of Sines / The Sine Rule

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Example-Finding Sides

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Example-Finding Angles

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Examples:

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Example

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Homework A Day Edition 2 Pg. 404 #1-3, 5-6, 9 Pg. 413 #1 and #4 Pg. 417 #1 Pg. 418 #1-2 B Day Edition 1 Pg.329-330 #1-3, 5-6, 12 Pg. 338-339 #1 and #4 Pg. 341 #1 Pg. 343 #1-2

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PreCalculus 6-1 Law of Sines. This lesson (and the next) is all about solving triangles that are NOT right triangles, these are called oblique triangles.

PreCalculus 6-1 Law of Sines. This lesson (and the next) is all about solving triangles that are NOT right triangles, these are called oblique triangles.

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