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角的大小與角兩臂的長度有關？
Author:
cwc
GeoGebra
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球体的体积推导（优化版）
畫出對稱圖形
兩位數加法
異分母分數減法
球体的体积推导
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Verification of Pythagoras Theorem 驗証畢氏定理
量角器3
中國剪紙技術_蝴蝶花
随机数表
線的面化
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Constructions
Mathematics
Ratios
Derivative
Similar Triangles