Cosine Rule Angle Example

How to use the Cosine Rule to find an Angle

How to apply the Cosine Rule to calculate an Angle The cosine rule is used in trigonometry and relates the lengths of any given triangle with the cosine of an angle. The formula for the cosine rule is a² = b² + c² - 2bcCos(A) where the lower-case letters are the lengths of the triangle and the upper-case letters are the angles of the ...

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