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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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Flat vs Solid Shapes

Mathematics · Geometry · conceptual

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

What mastery looks like

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

Check your understanding

Does Flat vs Solid Shapes 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?

Prerequisites

Required first

Unlocks (1 directly)

2-D faces on 3-D shapes