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Education Concept Tracker

A prerequisite knowledge graph of 1590 learning concepts across 8subjects. Track what you've mastered and see exactly what you're ready to learn next — the topics whose prerequisites you've already met. Built on the Marble Open Skill Taxonomy.

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Parallel and perpendicular lines

Mathematics · Geometry · conceptual

Identify horizontal and vertical lines and pairs of perpendicular and parallel lines

What mastery looks like

  • Point out horizontal and vertical lines in shapes and real-world contexts
  • Identify a pair of parallel lines (lines that never meet and are always the same distance apart)
  • Identify perpendicular lines (lines that meet at a right angle)

Check your understanding

If Parallel and perpendicular lines looks at a set of railway tracks or a window frame, can they point to which lines are parallel (never crossing) and which are perpendicular (meeting at a right angle)?