Mathematics·Geometry·conceptual
Angles in triangles (age 6+)
Distinguish defining attributes of shapes (e.g. triangles are closed and three-sided) from non-defining attributes (e.g. colour, orientation, overall size)
Suggested ages 6–7
Learning journey
Your child is discovering the world of shapes — identifying properties of 2D and 3D shapes, learning how to combine shapes to make new ones, and describing positions and movements using mathematical language.
Evidence of understanding
- Build and draw shapes that possess defining attributes
- Identify that a shape remains a triangle regardless of its size, colour, or orientation
- Explain why a given shape is or is not a particular type based on its defining properties
Assessment prompt
Does Angles in triangles (age 6+) understand that what makes a shape a triangle is having 3 sides and 3 corners — not its colour or which way it's pointing?
Standards alignment
1.G.1US · ccss-math
Distinguish defining attributes of shapes
Common Core State Standards for Mathematics · 1