The distance of the point $(1, 2, 3)$ from the $x$-axis is.......

In the figure,if $P$ is $(2, 4, 5)$,find the coordinates of $F$.

If the extremities of a diagonal of a square are $(1, -2, 3)$ and $(2, -3, 5)$,then the length of its side is

The sum of the squares of the perpendicular distances of a point $(x, y, z)$ from the coordinate axes is $k$ times the square of the distance of the point from the origin. Then $k=$

Show that the points $(-2, 3, 5), (1, 2, 3),$ and $(7, 0, -1)$ are collinear.

Which of the following is at a distance of $\sqrt{10}$ from the point $(1, 2, 3)$?