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初中八年级奥数：面积与面积法
Author:
王俊辉
拖动A、B、C、D，改变四边形形状
GeoGebra
New Resources
找出對稱軸
兩組對邊相等和有直角的四邊形
兩位數加法
拼砌四邊形
画直线等分三角形的面积
Discover Resources
任務1
color
有向角
這好難用
三角形外心的位置
Discover Topics
Equations
Vectors 3D (Three-Dimensional)
Dilation
Scatter Plot
Rotation