Cosine rule and sine rule triangle solver
Set two sides and the angle between them to find the third side, the other angles and the area.
Learn cosine rule properly
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Questions students ask
When do you use the cosine rule?
When you know two sides and the angle between them, or all three sides. Use the sine rule for opposite side–angle pairs.
What formula does it use?
a² = b² + c² − 2bc cos A; a/sin A = b/sin B; area = ½bc sin A.
Free notes on cosine rule
- Trigonometry — sine and cosine rules (KCSE Mathematics Form 4) · Introduction to AI for Students
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