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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
柱體建築師
【案例】圆柱体内放置一个大球六个小球
拼砌四邊形
畫出對稱圖形
兩位數除以一位數（二）
Discover Resources
以面積固定平行線軌跡
外公切線作圖
滑杆的數字接力賽-平移旋轉三角形填滿四邊形(加邊框)
Copy of 阿波羅尼斯圓
St. Line
Discover Topics
Exponent
Statistical Characteristics
Bar Chart or Bar Graph
Derivative
Reflection