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Ebbinghaus illusion
Author:
马宁
GeoGebra
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第八周作业1
撒针估算面积实验
盈利與虧蝕
中华人民共和国国旗
平行線的判定
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文氏圖
第三冊2-2習題12
正方形
圓點線
正四角柱(可旋轉)
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Dilation
Orthocenter
Polygons
Rhombus
Diagrams