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Properties of a Parallelogram
Author:
Lttcmooc
GeoGebra
New Resources
兩位數加法
三位數除以一位數（二）
找出對稱軸
拼砌四邊形
兩組對邊相等的四邊形
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層層出現的圓
認識公里
滑杆的數字接力賽-平移旋轉三角形填滿四邊形(加邊框)
If指令的應用1
三垂線定理
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Special Points
Orthocenter
Isosceles Triangles
Ratios
Boxplot