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二面角
Author:
qianqianhouhou
二面角的概念，拖动A、E点改变半平面
GeoGebra
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錐體建築師
判斷球體
三位數除以一位數（二）
兩組對邊相等的四邊形
兩位數除以一位數（一）
Discover Resources
橢圓軌跡(兩同心圓)102.12.04
Quiz on True Bearings 真方位角：測驗
菱形的特性
謝爾冰司機-正方形
Hello world
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Special Points
Geometry
Arithmetic
LCM and GCD
Surface