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三角形三边关系
Author:
数豆豆
GeoGebra
New Resources
撒针估算面积实验
平行線的判定
第八周作业
活动三：应用性质
异形操场
Discover Resources
封閉區域著色２
坐标变换
version 1
橢圓1--四圓心近似法
立體旋轉卡片
Discover Topics
Vectors 3D (Three-Dimensional)
Triangles
Tangent Function
Parallelogram
Similar Triangles