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### Geometry with McCarthy

Section 8-5: Law of Sines and Law of Cosines

Missy McCarthy Okemos High School Math Instructor

What you’ll learn

Objective:

Use the Law of Sines and Law of Cosines to solve problems with triangles.

Obtuse Angles

Up until this point, we’ve been focused on right triangles and trigonometric values for acute angles.

a. tan 165°

b. sin 94 °

Law of Sines

Law of Sines

For any triangle ABC with sides a, b, and c.

Law of Cosines

For any triangle ABC with sides a, b, and c.

Wrap-Up

Re-watch any parts of the video for a full understanding of Law of Sines and Law of Cosines

If you’re watching on YouTube, type questions in the comments section or jot them down and bring them to class.

Lesson quiz and worksheets tomorrow in class.

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