Combining Simple Shapes
Compose simple shapes to form larger shapes (e.g. two triangles make a rectangle)
Teaching approaches
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1 approach
Small shapes can combine into a bigger shape. Two identical right triangles can join along the long side to make a rectangle. We fit edges like puzzle pieces.
Spend about 10–15 minutes joining two triangles into a rectangle and naming the new shape.
Learning resources
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Check understanding
- Join two triangles to make a rectangle or larger triangle
- Use pattern blocks to fill a hexagon outline
- Create a picture or design by combining basic shapes
“Can your child fit smaller shapes together to make bigger ones — like combining two triangles to make a rectangle?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Geometry
- Age range
- Ages 5–6
Standards