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illusion若隐若现的白点（星海）
Author:
吴兴海
GeoGebra
New Resources
球體建築師
四邊形的特性
拼砌四邊形
兩組對邊相等的四邊形
畫出對稱圖形
Discover Resources
端點在兩圓周線段中點軌跡
天干與地支
滑桿動畫示範-2
排水法求不規則物件的體積
迭代多角星
Discover Topics
Ellipse
Planes
Percentages
Similarity Transformation or Similarity
Median Line