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20190530 與平行線有關的角
Author:
Hui Sir
GeoGebra
New Resources
sanjiaohanshu
四邊形的特性
拼砌四邊形
找出對稱軸
球體建築師
Discover Resources
test for fun
判斷球體 6
Percentage（百分法）
圍周
Copy of 固定周界的長方形的面積變化
Discover Topics
Terms
Set Theory
Pythagoras or Pythagorean Theorem
Pie Chart or Circle Chart
Statistics