Find the distance of the point `P(a ,b ,c)` from the x-axis.

Explanation

The coordinates of the foot of the perpendicular from the P on the x-axis are `a, 0 and 0`.
Therefore, the required distance is
`" "sqrt((a-0)^(2)+(b-0)^(2)+(c-0)^(2))=sqrt(b^(2)+c^(2))`.