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circle: line from centre
Author:
Ng Ching Yi
GeoGebra
New Resources
找出對稱軸
四邉形 (四年級) 教師版
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
Discover Resources
範例：自製工具「格線」
正四角錐
ｔｏ郁捷
滑桿動態指令(動畫根本指令)
Locus: P equidistant from two fixed points
Discover Topics
Cosine
Solids or 3D Shapes
Reflection
Parametric Curves
Continuity