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# Law of Cosines Part 1

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### Law of Cosines Part 1

1. 1. Triangles in Real Life<br />
2. 2. Triangles in Real Life<br />
3. 3. Triangles in Real Life<br />
4. 4. Triangles in Real Life<br />
5. 5. Today’s Objectives<br />Review right triangle trigonometry and triangle postulates<br />
6. 6. Today’s Objectives<br />Review right triangle trigonometry and triangle postulates<br />Use right triangle trigonometry to develop the law of cosines<br />
7. 7. Today’s Objectives<br />Review right triangle trigonometry and triangle postulates<br />Use right triangle trigonometry to develop the law of cosines<br />Use the law of cosines to solve problems<br />
8. 8. Review<br />A<br />B<br />C<br />
9. 9. Review<br />A<br />c = 10 cm<br />B<br />θ = ?<br />C<br />a = 8 cm<br />
10. 10. Review<br />A<br />c = 10 cm<br />b = ?<br />B<br />C<br />a = 8 cm<br />
11. 11. Go to Chat on the Main page.<br />Please pause for discussion.<br />A<br />c = 10 cm<br />b = ?<br />B<br />θ = ?<br />C<br />a = 8 cm<br />