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例题2（P点可拖动）
Author:
杜洋
GeoGebra
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兩組對邊相等和有直角的四邊形
算柱 (兩位數)
兩組對邊相等的四邊形
找出對稱軸
四邉形 (四年級) 教師版
Discover Resources
兩正弦波的合成波
封閉圖
複合棒形圖2
橢圓3-平行四邊形法
全景平面投影
Discover Topics
Differential Equation
Volume
Constructions
Triangles
Mode