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凸透鏡的成像（理想）
Author:
joeyliaw.tw
GeoGebra
New Resources
錐體建築師
畫出對稱圖形
拼砌四邊形
算柱 (兩位數)
找出對稱軸
Discover Resources
task7
Tangent from an external point
錯角---垂直平行綫
活工(三)Q2
Degrés vers radians
Discover Topics
Rotation
Algebra
Kite
Probability
Incircle or Inscribed Circle