Question

Which of the following point(s) have same projection on $z-$ axis as of point $P(-2,-1,-3)$ does ?

• A. $(1,2,3)$
• B. $(1,2,-3)$
• C. $(-3,-1,-2)$
• D. $(-3,-3,-3)$

Answer 1

Answer: (B), (D)

$(-3,-3,-3)$

Given point : $P(-2,-1,-3)$
We know, projection of $P(x,y,z)$ on $z-$axis is $(0,0,z)$
So, Projection of $P$ on $z-$axis is $(0,0,-3)$
Option $\left(i\right):$ projection of $(1,2,3)$ on $z-$axis is $(0,0,3),$
Option $\left(ii\right):$ projection of $(1,2,-3)$ on $z-$axis is $(0,0,-3),$
Option $\left(iii\right):$ projection of $(-3,-1,-2)$ on $z-$axis is $(0,0,-2)$
Option $\left(iv\right):$ projection of $(-3,-3,-3)$ on $z-$axis is $(0,0,-3),$