Curriculum placement
Grade 1. This describes the skill, not a learner estimate.
Defining attributes of shapes
Classify shapes by defining attributes
Problem types
- Count sides and corners
- Defining attributes
Builds on
- Naming shapes
- Building and drawing closed shapes · Earlier idea
Building a shape with sticks and clay balls shows the parts that make it that shape: straight sides, corners, and an outline that closes. Shape attributes name those parts and sort shapes by them.
Leads to
- Shapes made by putting shapes together
- Sides, angles, and faces
- Parallel lines, perpendicular lines, and symmetry
- When given measures make a triangle · See it applied
Whether three side lengths make a triangle depends on a defining attribute of triangles: the two shorter sides together must exceed the longest.
Related skills
- Comparing length, weight, and capacity · Related idea
Both skills describe an object by an attribute: length, weight or capacity for measuring, and sides or corners for shapes.
- Halves, thirds, and quarters · Related idea
Equal parts of a shape are partitions that depend on its attributes, such as sides of equal length.
- Composing shapes · Shared foundations
Open the interactive map to explore lessons and skill connections.