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External tangent

Author:jaycheung2016plk

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兩組對邊相等和有直角的四邊形
柱體建築師
畫出對稱圖形
找出對稱軸
球体的体积推导（优化版）

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三角形的高與面積
謝爾賓斯三角形
互化
百度
分数应用题数量关系线段图示

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Scatter Plot
Probability
Expected Value
Centroid or Barycenter
Similar Triangles

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