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Angle in alt.segment
Author:
Big Lee
GeoGebra
New Resources
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
找出對稱軸
四邊形的特性
第八周作业
Discover Resources
Apollonius Problem 5 CPP pocelet
蜘蛛網製作
工具：PlaneArrows, PlaneText... (v.2)
GGB 教程
紙張的長與闊
Discover Topics
Linear Equations
Parallelogram
Rotation
Symmetry
Derivative