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Author:
Tse Sir
GeoGebra
New Resources
Earth with coastline
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
第八周作业
拼砌四邊形
Discover Resources
阿基米德雙胞胎圓
教學－與直線有關的角
固定周界長方形的面積變化（三）
畢氏定理 (勾股定理) <Pythagorean theorem>
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Discover Topics
Arithmetic
Ellipse
Integers
Optimization Problems
Rational Numbers