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Angle Between a Line and a Plane Definition 線與平面的交角 定義
Author:
Steven S. H. Chu
GeoGebra
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漂亮的摇摆曲线
直線的斜率
祖冲之的期望：内棋与外棋
圓的切線方程
多邊形的面積
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定積分
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軸對稱的副本
Copia de 分數除法5: x ÷ a/b (包含)
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Constructions
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Kite
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