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The angle between the lines whose dire...

The angle between the lines whose direction cosines satisfy the equations `l+m+n=""0` and `l^2=m^2+n^2` is

A

`pi/4`

B

`pi/6`

C

`pi/2`

D

`pi/3`

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MODERN PUBLICATION-Three Dimensional Geometry-EXERCISE
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  2. The point P is the intersection of the straight line joining the point...

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  5. The image of the line (x-1)/3=(y-3)/1=(z-4)/(-5) in the plane 2x-y+z...

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  6. The angle between the lines whose direction cosines satisfy the equa...

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  7. The distance of the point (1,0,2) from the poitn of intersection of th...

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  8. The equation of the plane containing the line 2x-5y+z=3, x+y+4z=5 and ...

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  9. If the line, (x-3)/2=(y+2)/(-1)=(z+4)/3 lies in the place, l x+m y-z=9...

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  10. The distance of the point (1, -5, 9) from the plane x-y+z=5 measured a...

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  11. If a line has direction ratios <2,-1,-2>, then what are its direction ...

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  12. Find the Cartesian equation of the following plane: vecr cdot (hati+ha...

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  13. Show that the line , vecr=hati+hatj+lambda(2hati+hatj+4hatk) lies in t...

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  14. Find the area of the triangle whose vertices are : A(1,2,3), B(2,-1,4)...

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  15. Find the equations of the straight line passing through the point (2,...

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  16. Find the image of the point (1,6,3) in the line : x/1=(y-1)/2=(z-2)/3.

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  17. Find the equation of the plane passing through the point(-1, 3, 2) and...

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  18. Prove that if a plane has intercepts a,b,c and is at a distance of p u...

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  19. A line makes angles alpha, beta, gamma, delta with the diagonals of a ...

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