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Apollonius Problem 7 CCP Inversion simple
Author:
tkyggb
GeoGebra
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兩組對邊相等的四邊形
拼砌四邊形
判斷球體
柱體建築師
兩位數除以一位數（一）
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waaachen
T7 geobra
正n邊形內接縮小正n邊形
數學電腦繪圖與解題
F3 Ch9.3 羅盤及真方位角
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Translation
Combinatorics
Logarithm
Statistical Characteristics
General Quadrilateral