Sir, what will be the direction cosines of the line (x-2)/2=(2y-5)/-3 and z=4

Asked by DIVYA GARG | 14th Dec, 2013, 01:23: PM

Expert Answer:

The direction cosines of the line  are l, m and n.
Since we have z=4, the given line lies in the plane xy and it is perpendicular to the z axis.
 
Thus it makes an angle 90 degree with z axis.
 
Therefore the direction lines of the given line
 
 and z=4 are 2 , -3 and cos(90).
That is, the required direction cosines are 2, -3 and 0.

Answered by Vimala Ramamurthy | 14th Dec, 2013, 06:15: PM

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