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Match each term to its definition

Exercise and reference answers

Matching pairs
  1. Left
    Direction cosines
    Right
    cosines of the angles a line makes with the axes
  2. Left
    Direction ratios
    Right
    numbers proportional to the direction cosines
  3. Left
    Skew lines
    Right
    lines that neither meet nor run parallel
  4. Left
    l² + m² + n²
    Right
    always equals 1

Explanation

The chapter's four core definitions, taken straight from the summary. Source: syllabus Maths Part II, Ch 11 Three Dimensional Geometry.
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