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餘弦定理
Author:
yuchengda
GeoGebra
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兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
【案例】2013年安徽高考15题
異分母分數減法
柱體建築師
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三個硬幣的正面數
Pythagorean Theorem Proof with Shearing
三角形外心的位置
Measuring Volume 4
自製工具：CurveFit, Bezier
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Correlation
Calculus
Numbers
Median Line
Sphere