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If a line has direction ratios lt-2,-1,2...

If a line has direction ratios `lt-2,-1,2gt` then its direction - cosines are

A

`lt(2)/(3),(-1)/(3),(-2)/(3)gt`

B

`lt(-2)/(3),(-1)/(3),(2)/(3)gt`

C

`lt(-2)/(3),(-1)/(3),(-2)/(3)gt`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
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BETTER CHOICE PUBLICATION-THREE DIMENSIONAL GEOMETRY -PREVIOUS YEARS BOARD.S QUESTION FOR PRACTICE
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  6. Find the shortest distance between the following lines vec(r)=hat(i)...

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  11. Find the equation of the plane through the point (1,1,1) and perpendic...

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  14. Find the equation of the plane passing through the point (1,1,0),(1,2,...

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  15. Find the angle between the following pairs of lines x/2=y/2=z/1 and (x...

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  16. vec(r)=(1-t)hat(i)+(t-2)hat(j)-(3-2t)hat(k) and vec(r)=(1-t)hat(i)(t-...

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  17. Find the angle between these two lines (x+2)/(1)=(y-1)/(-2)=(z-1)/(1) ...

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  18. Find the vector equation of the plane which is at a distance of 7 unit...

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  19. Find the equation of the plane through intersection of the planes : ...

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  20. Find the equation of the plane passing through the points (1,2,-1),(...

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