Sine Law Homework Questions??? Pg. 25 # 3, 5, 7, 9.

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Sine Law Homework Questions??? Pg. 25 # 3, 5, 7, 9

Unit 1 The Cosine Law Learning Goal: I can Solve for a missing side or angle in a non-right triangle using cosine law

Recall: Sine Law Matching side and angle

Cosine Law We can solve for the third side We can solve for any angle

Example 1 How do you know you can use cosine law to solve this problem? Could we also use sine law? Label the sides of the triangle a, b, and c Calculate the missing side using cosine law 73⁰ 2.3 km 1.9km ? C A B

Example 2 How do you know you can use cosine law to solve this problem? Could we also use sine law? Label the sides of the triangle x, y, and z Calculate the missing side using cosine law (rewrite equation first) X Y Z 28⁰ 12.3 m11.9 m x

Example 3 How do you know you can use cosine law to solve this problem? Could we also use sine law? Label the sides of the triangle a, b, and c Calculate the angle B using cosine law 3.3 cm 3.8 cm 2.7 cm A B C

Practice Pg # 3, 5, 8, 9