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國旗
Author:
王正豪
GeoGebra
New Resources
四邊形的特性
第八周作业
找出對稱軸
四邉形 (四年級) 教師版
三位數除以一位數（二）
Discover Resources
waaachen
極線獨立定理 / polar independence theorem
蝴蝶定理推廣證明2(交比)
Brahmagupta 四邊形的構造方法
平行四邊形堆朵
Discover Topics
Conic Sections
Similar Triangles
Boxplot
Cuboid
General Quadrilateral