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Drag the red dots, see the area ratio of EHFG to ABCD
Author:
johnmayhk
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等的四邊形
三位數除以一位數（二）
異分母分數減法
拼砌四邊形
Discover Resources
圓柱動態展開圖
simulation of the uniform variable linear motion
倫敦滾石橋2
序列向量
畫三角形 題1a 的複本
Discover Topics
Step Functions
Difference and Slope
Logic
Fractal Geometry
Pie Chart or Circle Chart