理解角（8岁以上）
Understanding angles (age 8+)
理解不同类别的形状可能拥有共同属性，这些属性使它们归属于更大的类别；能对四边形（菱形、长方形、正方形）进行分类，并画出不属于这些子类别的四边形例子。
Understand that shapes in different categories may share attributes defining a larger category; classify quadrilaterals (rhombuses, rectangles, squares) and draw examples of quadrilaterals not in those subcategories
学习证据 / Evidence
- 解释正方形既是特殊的长方形，也是特殊的菱形。
- 用维恩图把图形分类为四边形、长方形和正方形。
- 画一个既不是长方形、菱形，也不是正方形的四边形。
- Explain that a square is a special rectangle and also a special rhombus
- Sort shapes into a Venn diagram: quadrilaterals vs rectangles vs squares
- Draw a quadrilateral that is not a rectangle, rhombus, or square
评估问题 / Assessment
如果向{{name}}展示一个正方形、一个长方形和一个菱形，他们能解释为什么这些图形都是四边形，以及它们彼此之间有什么不同吗？
If you show {{name}} a square, a rectangle, and a rhombus, can they explain what makes them all quadrilaterals — and what makes each one different from the others?