Curriculum placement
Grade 3. This describes the skill, not a learner estimate.
Classifying quadrilaterals
Classify quadrilaterals by shared attributes
Problem types
- The exact name of a quadrilateral
- Find the quadrilateral
Builds on
Leads to
- Categories and subcategories of shapes
- Proofs that use coordinates · See it applied
Proving that a quadrilateral drawn on a grid is a rectangle or parallelogram uses its category definitions.
Related skills
- Composing shapes · Related idea
Putting two triangles together along a side makes a quadrilateral, and which quadrilateral depends on the triangles.
- Symmetries of a polygon · Related idea
Which quadrilateral a shape is determines its lines and rotations of symmetry, such as the four lines of a square.
- Measuring angles · Shared foundations
Open the interactive map to explore lessons and skill connections.