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多边形对角线
Author:
张英华
GeoGebra
New Resources
兩組對邊相等的四邊形
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
畫出對稱圖形
第八周作业
Discover Resources
對稱
Escher 階梯 (Penrose Stair)
Staff Development Temp
在釘點紙上畫垂直線
带电粒子在匀强磁场中的运动
Discover Topics
Ratios
Prism
Normal Distribution
Linear Programming or Linear Optimization
Symmetry