正多边形与不规则多边形

基于对等边和等角的推理，区分正多边形和不规则多边形。

Distinguish between regular and irregular polygons based on reasoning about equal sides and equal angles

学习证据 / Evidence

• 将一组多边形归类为正多边形或不规则多边形
• 解释正五边形有5条相等的边和5个相等的角
• 识别出矩形是不规则多边形（角都相等但并非所有边都相等），除非它是正方形

• Classify a set of polygons as regular or irregular
• Explain that a regular pentagon has 5 equal sides and 5 equal angles
• Identify that a rectangle is irregular (equal angles but not all equal sides) unless it is a square

评估问题 / Assessment

如果你向{{name}}展示一个停车标志（正八边形）和一个歪歪扭扭的八边形，他们能解释哪个是正多边形、哪个是不规则多边形，并说明理由吗？

If you show {{name}} a stop sign (regular octagon) and a wonky eight-sided shape, can they explain which is regular and which is irregular — and why?