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四邊形內部反射_長寬角度可調整
Author:
boooooooyu
GeoGebra
New Resources
四邉形 (四年級) 教師版
直角坐標平面上的旋轉變換
畫出對稱圖形
異分母分數減法
兩組對邊相等的四邊形
Discover Resources
利用对称求线段和最值（移动端）
Distributive Law 1 (分配率 1)
St. Line
二分法优化版（视频教程见https://www.bilibili.com/video/BV1ST4y1F78g）
球体的截面
Discover Topics
Function Graph
Trigonometry
Rectangle
Similar Triangles
Rotation