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External tangent

Author:jaycheung2016plk

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兩位數加法
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
判斷球體
兩組對邊相等的四邊形

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拋物線(開口向上)
數據分析（1）
面外一點
sequence-circle
伍四红圆与正方形面积同周长比较

Discover Topics

Means
Right Triangles
Vectors 2D (Two-Dimensional)
Arithmetic Mean
Tangent Line or Tangent

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