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The modulus of a vector is its absolute value. It is the [positive] size or magnitude of the vector, ignoring its direction.

In two dimensional space, and using Pythagoras,

the modulus of the vector (x,y) is sqrt(x^2 + y^2)

In 3-dimensional space, the modulus of the vector (x, y, z) is sqrt(x^2 + y^2 + z^2)

The concept can be extended to higher dimensions analogously.


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