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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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Angles in triangles (age 6+)

Mathematics · Geometry · conceptual

Distinguish defining attributes of shapes (e.g. triangles are closed and three-sided) from non-defining attributes (e.g. colour, orientation, overall size)

What mastery looks like

  • Build and draw shapes that possess defining attributes
  • Identify that a shape remains a triangle regardless of its size, colour, or orientation
  • Explain why a given shape is or is not a particular type based on its defining properties

Check your understanding

Does Angles in triangles (age 6+) understand that what makes a shape a triangle is having 3 sides and 3 corners — not its colour or which way it's pointing?