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圖形的周界
Author:
samchan
,
Anthony OR 柯志明
GeoGebra
New Resources
兩位數除以一位數（二）
異分母分數減法
畫出對稱圖形
找出對稱軸
兩組對邊相等和有直角的四邊形
Discover Resources
光源距離 Light Source Distance
過圓內c點的弦中點軌跡
What's wrong
三視圖02
三垂線定理
Discover Topics
Optimization Problems
Translation
Fractal Geometry
Circumcircle or Circumscribed Circle
Subtraction