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TRIANGLE
Author:
Tina Lin
GeoGebra
New Resources
画直线等分三角形的面积
兩位數加法
四邊形的特性
兩位數除以一位數（二）
四邉形 (四年級) 教師版
Discover Resources
Reflection 反射變換
分割
摩天輪
固定周界的矩形
螺旋正方形
Discover Topics
Circle
Differential Equation
Quadrilaterals
Percentages
Vectors 2D (Two-Dimensional)