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二面角
Author:
qianqianhouhou
二面角的概念，拖动A、E点改变半平面
GeoGebra
New Resources
Fibonacci Clock
美國國旗 (Codex 版)
找出對稱軸
Nested spiral octagon
畫出對稱圖形
Discover Resources
不等式
等量公理
判斷柱體10
立體圖
百分數化分數
Discover Topics
Unit Circle
Hypothesis Testing
Histogram
Fractal Geometry
Geometric Mean