Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If the direction ratio of two lines are given by 
and 
, then the angle between the lines is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
We have, 
……(i)
……(ii)
From equation (i), 
Putting the value of l in equation (ii)
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ 
or 
……(i)
……(iii)
……(iv)
From equation (i) and equation (iii), 
From equation (i) and equation (iv), 
Thus, the direction ratios of two lines are 
and 
, 
.Hence, the angle between them π π /2.
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