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任意凸多边形的滚动
Author:
赵林
GeoGebra
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兩組對邊相等的四邊形
找出對稱軸
画直线等分三角形的面积
球體建築師
異分母分數減法
Discover Resources
直角梯形
三角柱
球體
鏡射的副本
初三第十五讲真卷4-23题
Discover Topics
Perimeter
Straight Lines
LCM and GCD
Circumcircle or Circumscribed Circle
Symmetry