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Author:
Big Lee
GeoGebra
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三位數除以一位數（一）
算柱 (兩位數)
柱體建築師
判斷球體
兩組對邊相等和有直角的四邊形
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Summary
線之極點定理 / pole of a line theorem
救生員區域
向量比換面積比
線性規劃
Discover Topics
Plane Figures or Shapes
Right Triangles
Parallelogram
Arithmetic
Triangles