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The angle between a line with direction ...

The angle between a line with direction ratios `lt 2, 2, 1gt` and a line joining the points `(3,1,4) and (7,2,12)` is

A

`cos^(-1) ((2)/(3))`

B

`cos^(-1) ((3)/(2))`

C

`tan^(-1) (-(2)/(3))`

D

none of these

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The correct Answer is:
A
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ICSE-THREE DIMENSIONAL GEOMETRY-MULTIPLE CHOICE QUESTIONS
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  2. If the planes x+2y+kz=5 and 2x +y-2z=0 are at right angles, then the v...

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  11. A vector parallel to the line of intersection of the planes overset(to...

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  12. The locus represented by xy+yz=0 is

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  13. If the planes overset(to)( r) (2 hat(i) - lambda (j) + 3 hat(k) ) = 0 ...

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  14. The equation of the plane passing through the point (1, 1, 0) and perp...

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  15. The distance of the point (2,1,-1) from the plane x-2y + 4z =9 is

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  16. The angle between a line with direction ratios lt 2, 2, 1gt and a line...

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  17. The lines (x-x1)/(a) = (y-y1)/(b) = (z-z1)/( c ) and (x-x1)/(a') = (y-...

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  18. The vector equation of the line passing through the points A(3,4,-7) a...

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  19. The vector equation of the line passing through the point (-1,5,4) and...

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  20. The line (x-2)/(3) = (y-3)/(4)= (z-4)/(5) is parallel to the plane

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