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gjc102a14 三角形內的高
Author:
均一
GeoGebra
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画直线等分三角形的面积
【案例】2013年安徽高考15题
判斷球體
兩組對邊相等的四邊形
球体的体积推导（优化版）
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平行四邊形變奏II
sghf
由線段與弧構成的封閉區域填色
塗色02
橢圓軌跡_過圓內一點與圓內切
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Algebra
Quadrilaterals
Plane Figures or Shapes
Natural Numbers
Diagrams