Sine and Cosine Rules

By the end of this unit, students will be able to:

• understand and apply the sine rule;
• understand and apply the cosine rule;
• find unknown lengths and angles in triangles using both rules.

Curriculum Alignment: Key Stage 4: Geometry and Measures

• {know and apply the sine rule,  =  =  , and cosine rule, a² = b² + c² – 2bc cos A, to find unknown lengths and angles}