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欧拉线与九点圆
Author:
吕胜
GeoGebra
New Resources
四邊形的特性
三位數除以一位數（一）
画直线等分三角形的面积
異分母分數減法
球体的体积推导
Discover Resources
vector addition and subtraction
波的干涉 Wave Interference
圓心角
線的面化
任意正N边形在圆内滚动顶点的轨迹
Discover Topics
Cube
Dilation
Linear Functions
Random Experiments
Linear Programming or Linear Optimization