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Q.
The distance of the point $A (2,3,4)$ from the $y$-axis is
Introduction to Three Dimensional Geometry
Solution:
We have to take the distance of point $A(2, 3,4)$ from $y$-axis.
So, we have to take the distance of $x$ and $z$ coordinate of
the point from origin
$= \sqrt{2^{2}+4^{2}}$
$= \sqrt{20} = 2\sqrt{5}$.