Question:medium

If the direction cosines of two lines satisfy the relations \[ l+m-n=0, \] \[ 3l^2+m^2+6nl=0, \] then those lines are

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If two lines have proportional direction ratios (or direction cosines differing only by sign), then they are \[ \boxed{\text{parallel}.} \] Always reduce the given relations to obtain the ratio of the direction cosines.
Updated On: Jul 18, 2026
  • parallel lines
  • perpendicular lines
  • skew lines
  • intersecting lines
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The Correct Option is A

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