What is the difference between sine rule and cosine rule?
The sine rule (a/sinA = b/sinB) suits two angles and a side; the cosine rule (c²=a²+b²−2ab·cosC) suits two sides and the included angle.
The sine rule (a/sinA = b/sinB) suits two angles and a side; the cosine rule (c²=a²+b²−2ab·cosC) suits two sides and the included angle. A reliable way to keep them apart is to focus on what each one is defined by, not just the similar-sounding words.
Key point
sine rule vs cosine rule
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