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The Cosine Rule
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The Cosine Rule
To find a missing side
- a = b + c - 2bc cos A
To find the missing angle
- cos A = b + c - a 2bc
The cosine rule applies to any triangle, you don't need a right angle.
You usually use the cosine rule when you are given two sides and the included angle (SAS) or when you are given three sides and want to work out an angle (SSS)
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- Mind Map on The Cosine Rule, created by rlatteman on 20/03/2014.
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- rlatteman
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