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Apollonius Problem gergonne 1
Author:
tkyggb
GeoGebra
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圓周公式的應用
兩位數加法
兩位數除以一位數（二）
三位數除以一位數（一）
漂亮的摇摆曲线
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構造切線 / construct the tangent line
第一冊
anlge at centre twice angle at circumference
拋物線2-焦點法
三角形的外心
Discover Topics
Circumcircle or Circumscribed Circle
Exponent
Dilation
Complex Numbers
Surface