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Author:
黃斌
GeoGebra
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球体的体积推导（优化版）
双心四边形
祖冲之的期望：内棋与外棋
圓的基本性質
平行線的斜率
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三角形全等的理由 – 題3
翰林B4課p227_9
球的内接三棱锥
初三第十五讲真卷4-23题
圆柱展开成平行四边形2
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Upper and Lower Sum or Riemann Sum
Square
Trigonometry
Distributions
Scalene Triangles