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tan90
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tan90
GeoGebra
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拼砌四邊形
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等的四邊形
四邊形的特性
GeoGebra笔记功能体验课件
Discover Resources
橢圓螺旋
正方形和長方形有甚麼特性？
中心对称和中心对称图形
正六角錐(旋轉，實體、透視)
「相似三角形」任务3的副本
Discover Topics
Trigonometric Functions
Multiplication
Special Points
Similar Triangles
Set Theory