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等腰三角形外接圓上弦AB
Author:
vinnyya
GeoGebra
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拼砌四邊形
判斷球體
第八周作业
球体的体积推导（优化版）
畫出對稱圖形
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Homework8
Ex5C#5
重心
練習_對稱
任意四边形各边中点的连线必构成平行四边形.许兴华数学
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Mathematics
Set Theory
Similar Triangles
Planes
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