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Same plane or different planes?

Exercise and reference answers

Items
  1. Item
    Two parallel lines
    Category
    Always in one plane
  2. Item
    Two intersecting lines
    Category
    Always in one plane
  3. Item
    Two lines meeting at the origin
    Category
    Always in one plane
  4. Item
    Two skew lines
    Category
    In different planes
  5. Item
    Lines that neither meet nor are parallel
    Category
    In different planes
Categories
  1. Item
    Always in one plane
  2. Item
    In different planes

Explanation

Only skew lines are forced into different planes parallel and intersecting lines are always coplanar. Source: syllabus Maths Part II, Ch 11 Three Dimensional Geometry.
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