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23平行线周长正方形

Author:万超杰

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近似值：有效數字
兩組對邊相等和有直角的四邊形
拼砌四邊形
Nested spiral octagon
球體建築師

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圖例
三角形的外接圓
固定三角形的條件−題5
P2 math
locus of a segment

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Geometric Transformations
Dilation
Cone
Triangles
Rational Numbers

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