Mathematics Geometry Conceptual 6–7 yrs

Angles in triangles (age 6+)

三角形中的角（6岁以上）

Description

Distinguish defining attributes of shapes (e.g. triangles are closed and three-sided) from non-defining attributes (e.g. colour, orientation, overall size)

Mastery Evidence
  • ✓ 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 your child understand that what makes a shape a triangle is having 3 sides and 3 corners — not its colour or which way it's pointing?

Prerequisites 2
2-D shapes
数学 · 4–6y
区分定义性属性与非定义性属性，需要先了解常见二维图形的名称
3-D shapes (age 5+)
数学 · 5–6y
识别定义性属性建立在对图形进行非正式分析和比较的基础上
Unlocks 2
2-D shapes (age 6+)
数学 · 6–7y
Angles in triangles (age 7+)
数学 · 7–8y