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等底等高的三角形
Author:
胡芸芃
GeoGebra
New Resources
平行線的斜率
讀磅
兩位數加法
兩位數除以一位數（二）
空间中两直线的位置关系
Discover Resources
圖形縮放展示
正八面體
凸多边形在直线上的滚动
弹簧振子的 简谐运动
DANDELIN
Discover Topics
Quadratic Functions
Perimeter
Trapezoid
Vectors 2D (Two-Dimensional)
Trigonometry