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Angles in triangles (age 6+)

CONCEPTUAL
Mathematics›Geometry|Ages 6—7|ID: mt_bfhng6mOuy

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

Mastery Evidence

  • 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

Assessment Prompt

“Does [child] understand that what makes a shape a triangle is having 3 sides and 3 corners — not its colour or which way it's pointing?”

Curriculum Standards1 alignment

1.G.1Common Core State Standards for Mathematics
Distinguish defining attributes of shapes

Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes.

G

Prerequisites2

Show full prerequisite tree
  • 2-D shapes hard

    Distinguishing defining vs non-defining attributes requires knowing common 2-D shape names first

  • 3-D shapes (age 5+) hard

    Identifying defining attributes builds on informal analysis and comparison of shapes

    • 2-D shapes hard

      Analysing and comparing shapes requires being able to name them first

    • 3-D shapes hard

      Analysing 3-D shapes requires recognising and naming them

Unlocks2