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If the angle between the lines with dire...

If the angle between the lines with direction ratios a, 3, 5 and 2, -1, 2 is `45^(@)`, then a =

A

2, 26

B

4, 52

C

2, 104

D

8, 26

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The correct Answer is:
B
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NIKITA PUBLICATION-THREE DIMENSIONAL GEOMETRY -MULTIPLE CHOICE QUESTIONS
  1. The acute angle between the lines whose direction ratios are 1, 1, 2 a...

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  2. An angle between the lines whose direction number are 1, -2, 1 and -6,...

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  3. If the angle between the lines with direction ratios a, 3, 5 and 2, -1...

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  4. If the angle between the vectors bar a and bar b having direction rat...

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  5. If the angle between the lines with direction ratios 2, -1, 1 and 1, k...

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  6. The two values of k for which the lines with direction ratios k, -6, ...

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  7. If the cosine of the angle between the lines with direction ratios 1, ...

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  8. The acute angle between the lines joining points (2, 1, 3) and (1, -1,...

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  9. If A-=(3,4-2),B-=(1,-1,2),C-=(0,3,2) and D-=(3,5,6), then the angle be...

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  10. The acute angle between the vectors bar(AB) and bar(CD), where A-=(1,2...

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  11. If triangleABC is right angled at B , where A(5,6,4), B(4,4,1) and C(8...

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  12. If Delta ABC is right angled at A, where A-=(4, 2, 3), B-=(3, 1, 8) an...

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  13. If DeltaABC, if A-=(3,2,6), B-=(1,4,5) and C-=(3,5,3), then m angle...

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  14. If A (0, 7, 10), B(-1, 6, 6) and C(-4, 9, 6) are the vertices of Delta...

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  15. If bar a, barb, barc are three mutually perpendicular vectors of equal...

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

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  17. Find the direction cosines of the two lines which are connected by ...

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

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

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

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