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Author:
GaryLee
GeoGebra
New Resources
兩組對邊相等的四邊形
畫出對稱圖形
兩位數除以一位數（二）
四邉形 (四年級) 教師版
第八周作业
Discover Resources
waaachen
illusion 鏡射
周界
作线段和角
任意角的生成
Discover Topics
Tree Diagrams
Complex Numbers
Expected Value
Pythagoras or Pythagorean Theorem
Tangent Line or Tangent