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Centres in a Triangle(三角形的中心)
Author:
chisunch1
GeoGebra
New Resources
拼砌四邊形
兩位數除以一位數（一）
判斷球體
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
Discover Resources
move
正整數的指數律練習
三角形的三角和及外心、內心圓
M2: disc/shell
軌跡 拋物線 (與點及線等距)
Discover Topics
Congruence
Rotation
Natural Numbers
Median Value
Expected Value