Q. 15.0( 3 Votes )
The direction ratios of two lines are 3, 2, -6 and 1, 2, 2, respectively. The acute angle between these lines is
A. 
B. 
C. 
D. 
Answer :
Direction ratio are given implies that we can write the parallel vector towards that line, lets consider the first parallel vector to be 
and second parallel vector be 
For the angle, we can use the formula 
For that, we need to find the magnitude of these vectors
The negative sign does not affect anything in cosine as cosine is positive in the fourth quadrant.
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.
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Mathematics - ExemplarMark against the correct answer in each of the following:
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RS Aggarwal - Mathematics
Mark against the correct answer in each of the following:
The angle between the line 
and the plane 
is
RS Aggarwal - Mathematics
