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Apollonius Problem 7 CCP Inversion simple
Author:
tkyggb
GeoGebra
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四邉形 (四年級) 教師版
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
拼砌四邊形
找出對稱軸
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cycloid
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