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斐波那契螺旋弧线（表格法-可动态调节）
Autor:
孟宝兴
GeoGebra
Nous materials
拼砌四邊形
兩組對邊相等的四邊形
柱體建築師
四邉形 (四年級) 教師版
兩位數加法
Descobriu materials
regular tetrahedron in a cube
九點共圓
Angle between 2 planes in a cube
Copy of 固定面積的圖形的周界變化
The change in SD after adding a constant
Descobriu Temes
Tangent
Simetria
Àrea
Prisma
Esfera