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包絡線：橢圓

Author:羅驥韡 (Pegasus Roe)

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画直线等分三角形的面积
球體建築師
畫出對稱圖形
兩組對邊相等的四邊形
兩位數除以一位數（二）

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不規則形陰影作圖2
盾牌~~~~
镂空菱形六十面体
圓心角兩倍於圓周角
Space-filling curve

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Polygons
Prism
Continuity
Indefinite Integral
Parallelogram

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