Question

The perpendicular distance of point $(18,5,12)$ from $x$-axis is _____.

Answer 1

A perpendicular is dropped from point $P(18,5,12)$ on the $x-$ axis.

The foot of the perpendicular will be $A(18,0,0)$

Distance $AP=\sqrt{{12}^2+5^2}=\sqrt{169}=13$