JEE Main & Advanced
Mathematics
Three Dimensional Geometry
Question Bank
System of Co-ordinates, Direction cosines and direction ratios, Projection
question_answer
If the co-ordinates of the points \[A,B,C,D\] be (2, 3, ?1), (3, 5, ? 3), (1, 2, 3) and (3, 5, 7) respectively, then the projection of \[AB\] on \[CD\] is
A) 0
B) 1
C) 2
D) \[\sqrt{3}\]
Correct Answer:
A
Solution :
Since AB and CD are perpendicular, therefore projection of AB on CD is 0.