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Author:
Ku, Yin Bon (Albert)
GeoGebra
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四邉形 (四年級) 教師版
兩位數除以一位數（一）
画直线等分三角形的面积
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
Discover Resources
萬花筒
同側AP-BP最大值
三垂線定理
正弦余弦刻度尺
Completing the Square (Part 6)
Discover Topics
Pythagoras or Pythagorean Theorem
General Quadrilateral
Equations
Ratios
Unit Circle