Question

If the co-ordinates of the points A, B, C, D be (1, 2, 3),

(4, 5, 7), (–4, 3, –6) and (2, 9, 2) respectively, then the angle between the lines AB and CD is

• A. $\frac { \pi } { 6 }$
• B. $\frac { \pi } { 4 }$
• C. $\frac { \pi } { 3 }$
• D. None of these

Answer 1

Answer: (D)

None of these

Answer 2

Here, dr.'s of line AB and CD are 3, 3, 4 and 6, 6, 8 respectively.

$\therefore$.