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祖恒原理
Author:
qianqianhouhou
拖动点C
GeoGebra
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找出對稱軸
兩組對邊相等的四邊形
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
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阿波羅尼亞圓
proof76 謝旻辰
圓與切線
工具：PlaneArrows, PlaneText... (v.2)
線的面畫
Discover Topics
Real Numbers
Hyperbola
Secant Line or Secant
Rotation
Triangles