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线绳艺术2（动图）
Author:
卢德洪
Topic:
Rotation
GeoGebra
New Resources
盈利與虧蝕
常见四边形是否是双心四边形
科赫雪花
圓的基本性質
第八周作业2
Discover Resources
任務4
Addition of 3 Directed Numbers
zztest
DSE Circle-ACT02B Angle at centre and circumference
gltyz 斜圓錐
Discover Topics
Area
Centroid or Barycenter
Arithmetic
Special Points
Quadrilaterals