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Author:
李春培
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GeoGebra
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兩組對邊相等和有直角的四邊形
畫出對稱圖形
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
球体的体积推导（优化版）
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卡特蘭數 (Catalan Number)
多物件逐一移動，單一物件分段移動
S2 Angles Related to Rectilinear Figures
基础知识
P.5 面積問題02
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Congruence
Expected Value
Secant Line or Secant
Symmetry
Prism