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circle: line from centre
Author:
Ng Ching Yi
GeoGebra
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三位數除以一位數（一）
異分母分數減法
三位數除以一位數（二）
兩位數加法
畫出對稱圖形
Discover Resources
Translation 平移變換
三角形外心的位置
地球儀
拋物線1--焦點法
正弦函数自变量的几何显示
Discover Topics
Indefinite Integral
Logic
Trigonometry
Centroid or Barycenter
Pythagoras or Pythagorean Theorem