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證平行四邊形 (對角線互相平分) (對邊 // 且相等)
Author:
誠誠老師
,
W.L. Wong, Albert
GeoGebra
New Resources
兩位數除以一位數（二）
三位數除以一位數（一）
錐體建築師
柱體建築師
判斷球體
Discover Resources
弦的中點軌跡
平面切割正立方體
畢氏定理
Compare areas by cutting shapes Q1
堆朵4邊形(試算表版)
Discover Topics
Symmetry
Prism
Straight Lines
Circle
Hypergeometric Distribution