The Sine Rule is used to solve any problems involving triangles, when at least either of the following is known:

·         a) two angles and a side

·         b) two sides and an angle opposite a given side

In Triangle ABC, we use the convention that

• ·  a is the side opposite angle A
• ·  b is the side opposite angle B    
•              c is the side opposite angle C

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·      

The sine rules enables us to calculate sides and angles in some triangles where there is no a right angle.

Using a labelled triangle, the sine rule is stated as:

1. Use when finding a side

2. Use when finding an angle.

 Write down the sine rule.

Take 5 minutes to write  the responses on your exercise books  before clicking on the feedback