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Author:
horizon liu
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
撒针估算面积实验
异形操场
圓的基本性質
龙形曲线-分形龙2
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平行四邊形之變奏I
固定三角形的條件−題3
How to reconstruct a quadrilateral farm to a triangular one with the same area?
多次分割平行四邊形
平面区域的理解
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Surface
Mathematics
Orthocenter
Polygons
Cylinder