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三角形内角和
Author:
yqzx0550
Topic:
Triangles
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等的四邊形
兩位數除以一位數（一）
判斷球體
三位數除以一位數（二）
Discover Resources
科博館的水畢氏三角
Angle (Extended 2)
圓在直線上滾動
算幾不等式
与两圆都相切的动圆圆心的轨迹
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Histogram
Ellipse
Function Graph
Trapezoid
Rotation