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Match each condition to what it means

Exercise and reference answers

Matching pairs
  1. Left
    l₁l₂ + m₁m₂ + n₁n₂ = 0
    Right
    the two lines are perpendicular
  2. Left
    Direction ratios are proportional
    Right
    the two lines are parallel
  3. Left
    Lines neither meet nor are parallel
    Right
    the lines are skew
  4. Left
    cos θ = 1
    Right
    the lines point the same way

Explanation

Reading the angle formula as a test. Source: syllabus Maths Part II, Ch 11 Three Dimensional Geometry.
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