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20170308
Author:
CDOMA7
GeoGebra
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探究三角形的全等條件
常见四边形是否是双心四边形
垂直線的斜率
圓的基本性質
球体的体积推导（优化版）
Discover Resources
正四面體對邊向量垂直作圖證明
HW1121505
櫻花鉤吻鮭
劉徽的「割圓術」
标题
Discover Topics
Circumcircle or Circumscribed Circle
Sequences and Series
Hyperbola
Mathematics
Division