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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
找出對稱軸
sanjiaohanshu
柱體建築師
球體建築師
拼砌四邊形
Discover Resources
三角形，邊上平分面積
直線與圓(直線方程式圖形特性1)
拼砌多邊形
Copy of 固定面積的圖形的周界變化
动感数学
Discover Topics
Quadrilaterals
Probability
Cuboid
Stochastic Process or Random Process
Reflection