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BrianchonTheorem20210930

Author:Peng-Jen Lai 賴鵬仁

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柱體建築師
判斷球體
錐體建築師
四邉形 (四年級) 教師版
異分母分數減法

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垂線性質2
內心
畢氏定理
射线上滚动椭圆
小正多边形在大正多边形内的滚动（边长不相等）

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Ratios
Polygons
Numbers
Right Triangles
Similar Triangles

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