jee-main 2021 Q77

jee-main · India · session2_16mar_shift1 Vectors 3D & Lines Distance from a Point to a Line (Show/Compute)

If for $a > 0$, the feet of perpendiculars from the points $A ( a , - 2 a , 3 )$ and $B ( 0,4,5 )$ on the plane $l x + m y + n z = 0$ are points $C ( 0 , - a , - 1 )$ and $D$ respectively, then the length of line segment $C D$ is equal to :
(1) $\sqrt { 31 }$
(2) $\sqrt { 41 }$
(3) $\sqrt { 55 }$
(4) $\sqrt { 66 }$

If for $a > 0$, the feet of perpendiculars from the points $A ( a , - 2 a , 3 )$ and $B ( 0,4,5 )$ on the plane $l x + m y + n z = 0$ are points $C ( 0 , - a , - 1 )$ and $D$ respectively, then the length of line segment $C D$ is equal to :\\
(1) $\sqrt { 31 }$\\
(2) $\sqrt { 41 }$\\
(3) $\sqrt { 55 }$\\
(4) $\sqrt { 66 }$

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