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Author:
Lin Ching Chieh
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
畫出對稱圖形
兩位數加法
四邉形 (四年級) 教師版
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Equal chords cut off equal arcs in a circle
Sectors 扇形
弦切角是圓心角的一半
量角器
Question 3
Discover Topics
Calculus
Ellipse
Equilateral Triangles
Parametric Curves
General Quadrilateral