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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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Lines, Rays & Angles

Mathematics · Geometry · procedural

Draw and identify points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines; identify these in two-dimensional figures

What mastery looks like

  • Draw a pair of perpendicular lines and a pair of parallel lines
  • Identify all pairs of parallel sides in a trapezoid
  • Mark a right angle, an acute angle, and an obtuse angle in a given figure

Check your understanding

If Lines, Rays & Angles is given a piece of paper and a ruler, can they draw a line segment, mark a point, and then draw another line through that point that runs perfectly parallel to the first?