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excenter of triangle
Author:
user7951
GeoGebra
New Resources
祖冲之的期望：内棋与外棋
空间中两直线的位置关系
三位數除以一位數（二）
讀磅
兩位數加法
Discover Resources
任務2
棋盤的 L 形覆蓋
線、面平行
線段前後分割
內心
Discover Topics
Circle
Probability
Tangent Function
Cosine
Geometric Transformations