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External tangent

Author:jaycheung2016plk

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球體建築師
兩位數加法
兩位數除以一位數（一）
三位數除以一位數（一）
畫出對稱圖形

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Locus 軌跡(1T)
錯覺藝術
三平行線上作正三角形
餘弦定理的圖形證明
面外一點

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Root
Square
Tangent Line or Tangent
Vectors 2D (Two-Dimensional)
Vectors

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