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If ltl,m,n,gtare D. cosines of a line th...

If `ltl,m,n,gt`are D. cosines of a line then `l^(2)+m^(2)+n^(2)=`

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PRADEEP PUBLICATION-THREE DIMENSIONAL GEOMETRY-EXERCISE
  1. True or false The vector equation of the line (x-5)/3=(y+4)/7=(z-6)/2 ...

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  2. The acute angle between the planes vecr.(2hati-3hatj+hatk)=1 and vecr....

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  3. If ltl,m,n,gtare D. cosines of a line then l^(2)+m^(2)+n^(2)=

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  4. The angle between the lines vecr=(5hati-hatj-4hatk)+lambda(2hati-hatj+...

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  5. True or false The distance of the point (-2,4,-5) from the line (x+3)/...

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  6. Find equation of a plane passing through the points (2,1,0),(3,-2,-2) ...

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  7. The equation of a line, which is parallel to 2hati+hatj+3hatk and whic...

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  8. True or false If the foot of perpendicular drawn from the origin to a ...

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  9. Direction cosines of x-axis are

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  10. Direction cosines of any normal to xy-plane are

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  11. Distance of the point (alpha, beta,gamma) from y-axis is

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  12. The distance of a point P(a,b,c) from x axis is:

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  13. If the direction cosine of a line are < k,k,k >, then,

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  14. If a line makes angles alpha,beta,gamma respectively with positive dir...

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  15. Distance of the point (alpha, beta,gamma) from y-axis is

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  16. The co-ordinates of foot of the perpendicular drawn from the point (2,...

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  17. The equation of x-axis is of the form

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  18. A set of D.R of the line vecr=(hati+hatj+hatk)+1(2hati+3hatj+6hatk)are

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  19. If alpha, beta, gamma are the angles that a line makes with the positi...

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  20. P is a point on the line segment joining the points (3, 2, -1) and (6,...

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