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三角形的高與面積
Author:
+x sir
GeoGebra
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拼砌四邊形
三位數除以一位數（一）
兩組對邊相等的四邊形
兩位數加法
兩位數除以一位數（一）
Discover Resources
阿基米德(3,10,10)
Angle between 2 planes in a cube
Cuboid 長方體
对数函数——底数大小与图形
圓外切四邊形
Discover Topics
Logarithm
Parallelogram
Geometric Distribution
Polygons
Geometric Mean