GCSE Maths Sine and Cosine Rule Revision in Worthing
The sine rule and cosine rule extend trigonometry to non-right-angled triangles. Students need to label sides and angles carefully before choosing a method.
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Key skills
- Labelling sides and opposite angles
- Choosing sine rule or cosine rule
- Finding missing sides
- Finding missing angles
Exam tip: Use the cosine rule when you have two sides and the included angle, or all three sides.
Common mistake: A common mistake is using the sine rule when the known angle is not opposite a known side.
Video explanation
A short Worthing Maths Tutor video explanation for GCSE Maths Sine and Cosine Rule can be embedded here later to improve student engagement and time on page.