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Author:
tan90t
GeoGebra
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常见四边形是否是双心四边形
百分數及其應用
比較五件物件的重量
直線的斜率：水平變化 & 鉛垂變化
平行線的斜率
Discover Resources
了解圓方程(1)
球內接正方體
面積2
五組搶答
阿波羅尼斯圓 的複本
Discover Topics
Ellipse
LCM and GCD
Vectors 2D (Two-Dimensional)
Parabola
Symmetry