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If the cosine of the angle between the l...

If the cosine of the angle between the lines with direction ratios 1, -1, 2 and 0, 1, k is `(sqrt(3))/(2)`, then k =

A

`-1, -7`

B

`1, -7`

C

`-1, 7`

D

1, 7

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The correct Answer is:
A
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NIKITA PUBLICATION-THREE DIMENSIONAL GEOMETRY -MULTIPLE CHOICE QUESTIONS
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  10. If A (0, 7, 10), B(-1, 6, 6) and C(-4, 9, 6) are the vertices of Delta...

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  12. The angle between the lines whose direction cosines satisfy the equ...

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  14. Find the acute angle between the two straight lines whose direction co...

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  15. The direction cosines l, m and n of two lines are connected by the rel...

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  16. If the direction ratio of two lines are given by 3lm-4ln+mn=0 and l+2m...

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