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折射的現象
Author:
Jia-ming Shiu
拉動G，看出虛擬呈現
GeoGebra
New Resources
判斷球體
畫出對稱圖形
球體建築師
兩組對邊相等的四邊形
三位數除以一位數（二）
Discover Resources
小學數學科 HTML5 Applets
形心
阿波羅尼斯問題：與三圓相切的圓
圓周
康托
Discover Topics
LCM and GCD
Matrices
Complex Numbers
Correlation
Pythagoras or Pythagorean Theorem