认识角
Understanding angles
认识角是图形的一种属性，也可以用来描述转动
Recognise angles as a property of shape or a description of a turn
学习证据 / Evidence
- 能识别二维图形边角上的角
- 能描述转动（如四分之一转、半转）与角的关系
- 能说明角度量的是两条线相交于一点时的旋转量
- Identify angles at the corners of 2-D shapes
- Describe a turn (e.g. quarter turn, half turn) in terms of the angle made
- Explain that an angle measures the amount of turn between two lines meeting at a point
评估问题 / Assessment
如果请{{name}}指出书本角或门框上的一个角，他们能找到吗？并且能解释打开一扇门也是一种转动（形成角）吗？
If you ask {{name}} to point to an angle on the corner of a book or door frame, can they find it — and explain that swinging a door open is also a kind of turn (angle)?