角的类型（11岁及以上）
Types of angles (age 11+)
运用常规几何术语和记号来描述、勾画和绘制点、直线、平行线与互相垂直的直线、直角、正多边形，以及具有反射对称或旋转对称的多边形。
Use conventional geometric terms and notation to describe, sketch, and draw points, lines, parallel and perpendicular lines, right angles, regular polygons, and reflectively/rotationally symmetric polygons
学习证据 / Evidence
- 使用正确的记号来表示线段（AB）、角（∠ABC）和平行线（AB ∥ CD）。
- 画出正六边形的草图，并描述它的旋转对称和反射对称。
- 在给定图形中，用标准符号识别并标出互相垂直的直线和平行线。
- Use correct notation for line segments (AB), angles (∠ABC), and parallel lines (AB ∥ CD)
- Sketch a regular hexagon and describe its rotational and reflective symmetry
- Identify and label perpendicular and parallel lines in a given figure using standard symbols
评估问题 / Assessment
如果让{{name}}用规范的几何记号描述一个三角形，并用字母命名它的角和边，该生能否描述得足够清楚，让别人据此画出来？
If you ask {{name}} to describe a triangle using proper geometry notation — naming its angles and sides with letters — can they do it clearly enough for someone else to draw it?