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椭圆的离心率
Author:
孟宝兴
GeoGebra
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多邊形的面積
常见四边形是否是双心四边形
漂亮的摇摆曲线
【案例】2013年安徽高考15题
直線的斜率：水平變化 & 鉛垂變化
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固定周界的長方形的面積變化
locus wrt two pts on two indep. circle
過點切圓的動圓圓心軌跡
DSE Circle-ACT01C Distance between Chords and Centre of a Circle
躲掉1,-1,0的動態文字
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Root
Centroid or Barycenter
Kite
Set Theory
Rhombus