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三心：與三角形形狀的關係
Author:
葉宇笙
可以拉動頂點改變三角形，觀察三心位置變化。
GeoGebra
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畫出對稱圖形
算柱 (兩位數)
三位數除以一位數（二）
柱體建築師
兩組對邊相等的四邊形
Discover Resources
方格紙上畫正方形1
test
我的第一個GGB影片
L: y=mx+1
Copy of angle between line and plane
Discover Topics
Algebra
Complex Numbers
Means
Curve Sketching
Correlation