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鉛筆畫圓
Author:
30張婷淯
GeoGebra
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多邊形的面積
撒针估算面积实验
祖冲之的期望：内棋与外棋
平行線的斜率
比較五件物件的重量
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四心的變化II
部分佔全部的百分率 :例2
圖C
同旁內角---垂直平行綫
橢圓規Ellipsograph of Parallelogram
Discover Topics
Natural Numbers
Congruence
Algebra
Rhombus
Integral Calculus