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直徑式的原理
Author:
luke huang
GeoGebra
New Resources
球体的体积推导
判斷球體
拼砌四邊形
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
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test for 2nd view
比較圖形大小2
平行四邊形面積
例题2（P点可拖动）
N邊形滾動的副本
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Diagrams
Root
Set Theory
Secant Line or Secant
Line Segment