The sine and cosine rules
The sine rule, the cosine rule and area = ½ab sin C for triangles without a right angle, and how to choose between them.
You will be able to
- Choose the sine rule, the cosine rule or the area formula
- Find a side or an angle with the sine rule
- Find a side or an angle with the cosine rule
- Find the area of any triangle with ½ab sin C
25 minutes, 8 exam-style questions.