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蝴蝶公式
Author:
Gideon Huang
請拖曳A、B、C、D四點，觀察角A、角B、角C、角D的關係
GeoGebra
New Resources
球體建築師
兩位數除以一位數（二）
兩位數加法
柱體建築師
算柱 (兩位數)
Discover Resources
橢圓的定義畫圖
angle between lines
单晨整体迭代希尔伯特-你的k到几
三角函數圖解 的複本
三棱锥的体积推导的副本
Discover Topics
Vectors 3D (Three-Dimensional)
Kite
Interest Calculation
Sphere
Cosine