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動圓的圓心軌跡為橢圓

Author:Ho-Kai Chen

拉動大圓上的N點, 觀察圖形的變化!

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找出對稱軸
小数的副本
直角坐標平面上的旋轉變換
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形

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Equal chords and their distances from the centre
餘弦定理
銀杏葉
拿破侖定理(外拿破侖)證明二
金惠吉：三维李萨如

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Bar Chart or Bar Graph
Stochastic Process or Random Process
Interest Calculation
Linear Functions
Integers

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