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外心
Author:
Bennie Liu
GeoGebra
New Resources
画直线等分三角形的面积
畫出對稱圖形
找出對稱軸
四邉形 (四年級) 教師版
兩位數除以一位數（一）
Discover Resources
旋轉對稱
Lens
Twist Bottle
圓形
探究判定全等三角形的条件（ SSA? & HL！）
Discover Topics
Conic Sections
Reflection
Function Graph
Trigonometry
Confidence Interval