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初三奥赛：圆的切割线问题
Author:
王俊辉
拖动点P，或点D，改变其位置，探究点F的轨迹。
GeoGebra
New Resources
兩組對邊相等的四邊形
Fibonacci Clock
畫出對稱圖形
近似值：有效數字
長方體平面投影 (Codex版)
Discover Resources
example
聖誕樹
正方形周界
三个平面两两相交
數值滑桿動畫
Discover Topics
Boxplot
Logarithmic Functions
Arithmetic Operations
Congruence
Sphere