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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
柱體建築師
兩組對邊相等和有直角的四邊形
兩位數加法
判斷球體
兩組對邊相等的四邊形
Discover Resources
教學－與直線有關的角
同弓形內的圓周角
Graph of Tangent
Copy of 賺賠：例1
Sunrays with different angles
Discover Topics
Addition
Pyramid
Logarithmic Functions
Scalene Triangles
Incircle or Inscribed Circle