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讀磅

Author:: M.T. Chan

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对角线互相垂直的四边形，证倍分关系的副本
学问思1206-2
每日一题1205
学而思1206
程自顺98

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Symmetric設計對稱圖案(一條對稱軸)
horizontal
P53_3c
perimeter
All in one (centres of triangle)

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Cylinder
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