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直角三角形的內心與相似
Author:
鍾文欽
GeoGebra
New Resources
画直线等分三角形的面积
GeoGebra笔记功能体验课件
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
Discover Resources
happy birthday
畢氏定理動態證明(歐基里得，平形四邊形等面積，應用polyline)
弦心距比較
[問題] 橢圓兩焦點 (6,0), (0,8)
Apollonius Problem poncelet fouche
Discover Topics
Angles
Function Graph
Interest Calculation
Dilation
Combinatorics