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證平行四邊形 (對角線互相平分) (對邊 // 且相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
錐體建築師
四邊形的特性
【案例】2013年安徽高考15题
兩位數除以一位數（二）
球体的体积推导（优化版）
Discover Resources
正四面體
Escher 階梯
Is this a prism 6
Triangle
對頂角_1
Discover Topics
Parallelogram
Prism
Similarity Transformation or Similarity
Arithmetic
Curve Sketching