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厚會聚透鏡 Thick Convergent Lens
Author:
W.L. Wong, Albert
GeoGebra
New Resources
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
兩位數加法
異分母分數減法
三位數除以一位數（二）
Discover Resources
高中二年級平面向量
Travel Graph 行程圖
binary and hexadecimal
三角形的外心
繪本
Discover Topics
Trigonometry
Isosceles Triangles
Vectors 3D (Three-Dimensional)
Ellipse
Centroid or Barycenter