The shortest distance of the point from P(x1 ,y1 , z1) the x-axis is equal to

$\sqrt{x_1^2+y_1^2}$ $\sqrt{x_1^2+z_1^2}$ $\sqrt{y_1^2+z_1^2}$ None of these

$\sqrt{y_1^2+z_1^2}$

Foot of perpendicular drawn from P to x-axis will have its coordinates as (x, 0, 0). ∴ Required distance = $\sqrt{y_1^2+z_1^2}$