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Flat vs Solid Shapes

CONCEPTUAL
Mathematics›Geometry|Ages 5—6|ID: mt_mnEVZNkX3p

Distinguish two-dimensional (flat) shapes from three-dimensional (solid) shapes

Mastery Evidence

  • Sort shapes into 'flat' and 'solid' groups
  • Explain that a circle is flat but a sphere is solid
  • Identify whether a given shape is 2-D or 3-D

Assessment Prompt

“Does [child] understand the difference between a flat shape like a square and a solid shape like a cube — and can they sort everyday objects into flat or solid?”

Curriculum Standards1 alignment

K.G.3Common Core State Standards for Mathematics
Identify Two-Dimensional and Three-Dimensional Shapes

Identify shapes as two-dimensional (lying in a plane, “flat”) or three-dimensional (“solid”).

Geometry

Prerequisites2

Show full prerequisite tree
  • 2-D shapes hard

    Distinguishing 2-D from 3-D requires knowing what 2-D shapes are

  • 3-D shapes hard

    Distinguishing 2-D from 3-D requires knowing what 3-D shapes are

Unlocks1