# Section 8.1: Non-right Triangles: Law of Sines and Cosines

**Section 8.1 Videos**

Video Lessons

- The Law of Sines: The basics
- The Law of Sines: The ambiguous case
- The Law of Cosines
- The Law of Cosines: Applications
- The Area of a Triangle Using Heron’s Formula

Video Examples

- The Law of Sines: Applications I
- The Law of Sines: Applications 2
- Example: Solve a Triangle Using the Law of Sines (given two sides and an angle)
- Example: Solve a Triangle Using the Law of Sines (given two angles and one side)
- Example 1: Determine an Unknown Length Using the Law of Sines
- Example 2: Determine an Unknown Length Using the Law of Sines
- Example 3: Determine an Unknown Length Using the Law of Sine (airplane problem)
- Example 1: Application of the Law of Cosines (width of lake)
- Example 2: Application of the Law of Cosines (distance plane travels)
- Example 3: Application of the Law of Cosines (diagonal of parallelogram)
- Example 4: Application of the Law of Cosines (measure of an angle)

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