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弦图面积平移法
Author:
杨华
GeoGebra
New Resources
兩組對邊相等的四邊形
找出對稱軸
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
【案例】2013年安徽高考15题
Discover Resources
標準差：測驗
雜類(Miscellaneous)
Viviani's curve
動態模擬(摺紙）(1060724)
justin sin
外心
Discover Topics
Orthocenter
Quadrilaterals
Diagrams
Piecewise Functions
Triangles