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Copy of 周界
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kennylau
,
spkwan
GeoGebra
modified by spkwan, uploaded 16 October 2011
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画直线等分三角形的面积
三位數除以一位數（二）
球體建築師
兩組對邊相等的四邊形
畫出對稱圖形
Opdag Ressourcer
包絡橢圓
rotational symmetry_1
Net of circular cone
正立方體截痕
圓錐曲線－圓錐截痕
Udforsk emner
Fordelinger
Parallelforskydning
Vektorer
Boksplot
Omkreds