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线动成面（广州塔）
Author:
蔡永志
GeoGebra
New Resources
球體建築師
判斷球體
兩組對邊相等和有直角的四邊形
柱體建築師
近似值：有效數字
Discover Resources
旋轉體 (Disk Method)
荒島尋寶
Locus指令的練習
拋物面光學性質
变化的三角形的内心.许兴华数学
Discover Topics
Line Segment
Fractal Geometry
Terms
Numbers
Symmetry