Non-Right+Angle+Trigonometry

**__Non-Right Angle Trigonometry__** The sine and cosine rules allow the application of trigonometry to the solution of problems involving triangles other than right triangles. __**Lesson 1 - The Sine Rule **__ Open these files and save them to your laptop for the lesson notes on Exercise 9.1

Watch this video to hear The Sine Rule Song. media type="youtube" key="qvvySP1nsM8?rel=0" height="360" width="480" align="center" __**Lesson 2 - Area of a Triangle **__ Open these files and save them to your laptop for the lesson notes on Exercise 9.2

Watch this video for the mathematical proof of the cosine rule. media type="youtube" key="J3WIPS3Uh_A?rel=0" height="360" width="480" __**Lesson 3 - The Cosine Rule **__ Open these files and save them to your laptop for the lesson notes on Exercise 9.3  

Watch this video for tips on when to use the sine rule or cosine rule.

media type="youtube" key="ZeMSUFsh8hs?rel=0" height="360" width="640" align="center" __**Lesson 4 - Mixed Examples **__ Watch this video to review the sine rule, area of a triangle and cosine rule before attempting Exercise 9.4 <span style="font-family: 'Comic Sans MS',cursive; font-size: 150%;">media type="youtube" key="HkVE_XtMxKI?rel=0" height="360" width="640"