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九點圓
Author:
Wu Xiao-Ren
三角形的三中點，三垂足，三頂點到垂心中點共圓
GeoGebra
New Resources
四邊形的特性
找出對稱軸
球體建築師
拼砌四邊形
異分母分數減法
Discover Resources
橢圓參數式
下和
偏心的農夫?
thm 11,12
圓內接四邊形任務二
Discover Topics
Limits
Translation
Rotation
Geometric Mean
Logarithm