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角的大小與角兩臂的長度有關？
Author:
cwc
GeoGebra
New Resources
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
第八周作业
GeoGebra笔记功能体验课件
Discover Resources
了解圓方程(0)
小圓內繞大圓
Rectangle
一次函数图像
用平面截圆锥
Discover Topics
Incircle or Inscribed Circle
Straight Lines
Set Theory
Square
Sphere