Question

The distance of a point $P(x,y,z)$ from its image in $xy-$ plane is :

• A. $2|y|$
• B. $2|z|$
• C. $|x|+|y|$
• D. $2\sqrt{x^2+y^2}$

Answer 1

The correct option is B $2|z|$

Distance of a point $(x,y,z)$ from $xy$-plane is given by $\mid z\mid$.
$\therefore$ The distance of the point $(x,y,z)$ from its image in $xy$-plane $=2\mid z\mid$