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World 4 · Lines and planes · 9 min · PRO

A line is a point plus a direction

PRO · Vector Lab

World 4: Lines and planes is part of PRO

The first world of Vector Lab is free. PRO opens the other 21 lessons in 6 worlds — simulations, quizzes and all.

  • Solve where a line meets a plane
  • No crossing, or infinitely many
  • Two decaying directions
  • One calm path cannot prove stability
  • Stable does not always mean attracting
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

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