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Algebraically in two dimensions:
Geometrically in two dimensions:
In higher dimensions the formula is the same, and we find the angle between the vectors by considering the plane that contains both vectors.
AbsoluteValue Adding2DVectors AddingVectors ArgandDiagram MathematicsTaxonomy UnitVector VectorSubtraction 
(none)  DifferenceOfTwoSquares EquationOfALine LinearFunction Matrices MatrixTransformation TypesOfNumber 

MagnitudeOfAVector Vectors 
MatrixMultiplication Quaternion 

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AbsoluteValue Adding2DVectors AddingVectors CategoryMetaTopic PythagorasTheorem RationalNumber RealNumber SquareRoot 
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