Question

The length of the perpendicular drawn from the point P(a, b, c) on z-axis is ___________________.

Answer 1

For given point (a, b, c) z coordinate is c
i.e. any point on z-axis is of the form (0, 0, c)
Hence length of perpendicular from (a, b, c) an z-axis is given by $\sqrt{{\left(a-0\right)}^2+{\left(b-0\right)}^2+{\left(c-c\right)}^2}$

$=\sqrt{a^2+b^2}$