圆的组成部分
Parts of a circle
画出并说出圆的各部分名称，包括半径、直径和周长；知道直径是半径的两倍。
Illustrate and name parts of circles, including radius, diameter, and circumference; know that the diameter is twice the radius
学习证据 / Evidence
- 在圆的示意图上标出半径、直径和周长。
- 已知半径为4.5厘米，计算直径（直径=9厘米）。
- 用自己的话解释半径和直径之间的关系。
- Label the radius, diameter, and circumference on a circle diagram
- Calculate the diameter given a radius of 4.5 cm (diameter = 9 cm)
- Explain the relationship between radius and diameter in their own words
评估问题 / Assessment
如果你给{{name}}一个圆形盘子和一把直尺，他们能测量出直径，并解释半径与直径之间的关系吗？
If you give {{name}} a round plate and a ruler, can they measure the diameter — and explain how the radius compares to the diameter?