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證平行四邊形 (對邊相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
兩位數除以一位數（一）
錐體建築師
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
兩位數加法
Discover Resources
正四面體、正六面體、正八面體
長方體透視圖(三頂點組成三角形)
正六邊形串珠
Cycloid
Uses of Trigonometry
Discover Topics
Similarity Transformation or Similarity
Expected Value
Volume
Cone
Right Triangles