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2:53
YouTube
Maths Mark
The Cosine Rule. How To Work Out The Missing Side Length In A Non Right Angled Triangle.
This video will teach you the cosine rule, so you can calculate the missing side in a non right angled triangle when you are given an angle between two sides, and you need the side opposite the angle. The formula for the cosine rule is a^2 = b^2 + c^2 – 2bcCosA. The small letters are the side lengths and the capital letters are the angles ...
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