直角与旋转
Right Angles & Turns
识别直角；知道两个直角组成半圈，三个直角组成四分之三圈，四个直角组成一整圈。
Identify right angles; recognise that two right angles make a half-turn, three make three-quarters, and four make a complete turn
学习证据 / Evidence
- 使用直角检查器辨认图形和周围环境中的直角
- 将角分类为直角、小于直角的角或大于直角的角
- 解释4个直角组成一整圈（360°）
- Use a right-angle checker to identify right angles in shapes and the environment
- Classify angles as right angles, less than a right angle, or greater than a right angle
- Explain that 4 right angles make a full turn (360°)
评估问题 / Assessment
如果{{name}}看着一张纸的角，能不能说出这是一个直角，并且转一整圈需要四个直角？
If {{name}} looks at the corner of a piece of paper, can they tell you that's a right angle — and that spinning all the way round takes four right angles?