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Author:
李政憲
GeoGebra
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兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
判斷球體
【案例】圆柱体内放置一个大球六个小球
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對角線
Irregular shape
拋物線的兩切線
Centroid
楼梯
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General Quadrilateral
Functions
Natural Numbers
Combinatorics
Definite Integral