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多邊形周界A
Author:
Fung Kai NO.1 Primary School
GeoGebra
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四邊形的特性
拼砌四邊形
三位數除以一位數（一）
兩位數除以一位數（一）
【案例】2013年安徽高考15题
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神之作
量角器2
七巧板（tangram）的副本
v型咖啡濾網
双镜面反射问题
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Equilateral Triangles
Cylinder
Limits
Quadrilaterals
Circumcircle or Circumscribed Circle