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Write the length (magnitude) of a vector...

Write the length (magnitude) of a vector whose project on the coordinate axes are 12,3 and 4 units.

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Projection on the coordinate axes are given `12,3` and `4` units.
`therefore` Required length of the vactor is,
`=sqrt{12^2+3^2+4^2}`
`=sqrt{169}`
`=13` units.
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