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與兩圓相切的動圓圓心軌跡
Author:
Wu Xiao-Ren
GeoGebra
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折扣
圓的基本性質
双心四边形
祖冲之的期望：内棋与外棋
讀磅
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鑲嵌圖形-2 SAKULA
青字歌
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自製工具：CurveFit, Bezier
k的几何意义
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Sphere
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Pyramid