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三角形的内切圆与外接圆
Author:
夜雨嘀嗒
GeoGebra
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中华人民共和国国旗
龙形曲线-分形龙
盈利與虧蝕
撒针估算面积实验
龙形曲线-分形龙2
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平行四邊形面積教材四
軌跡,摺紙,滾動,實驗觀察,曲線
Building Cylinders 建造圓柱體
四邊形四個九點圓共點(九點心)
三角格紋
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Special Points
Coordinates
Statistics
Definite Integral
Arithmetic