# data[].attributes.body
Cosine rule equation
= 2ab cosC

# data[].attributes.body
The cosine rule. We can use the cosineformula to find the length of a side or size of an angle. For a triangle with sides a,b and c and angles A, B and C the cosine rule can be written as: a2 = b2 + c2 - 2bc cos A

# data[].attributes.body
The cosine rule. We can use thecosine formula to find the length of a side or size of an angle. For a triangle with sides a,b and c and angles A, B and C the cosine rule can be written as: a2 = b2 + c2 - 2bc cos A. or.

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https://www.mathsisfun.com/algebra/trig-cosine-law.html