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與三個半圓相切之圓的填滿
Author:
劉彥宏
GeoGebra
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【案例】2013年安徽高考15题
球体的体积推导（优化版）
錐體建築師
拼砌四邊形
找出對稱軸
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雪花(碎形)
三角形3,4,5
繪圖
Rotational symmetry of triangular prism
动感数学
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Correlation
Cosine
Cone
Median Line
Ellipse