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y=sinx对称中心
Author:
张金伟
GeoGebra
New Resources
兩組對邊相等的四邊形
國旗 (作圖步驟直接餵給 Claude)
近似值：有效數字
拼砌四邊形
兩組對邊相等和有直角的四邊形
Discover Resources
dabuhe
Copy of 可01
Geometry: Angles Sum of Triangle (幾何：三角形內角和)
Copy of 平行四邊形的面積
黃金矩形
Discover Topics
Perimeter
Tangent Line or Tangent
Area
Sequences and Series
Arithmetic