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公切線的引入
Author:
Gideon Huang
Topic:
Geometry
GeoGebra
New Resources
画直线等分三角形的面积
異分母分數減法
判斷球體
錐體建築師
球体的体积推导（优化版）
Discover Resources
Equations of Circles 圓方程
同心圓和線段-3(線段到最外圓有小圓)
螢橋國中 鄭毅華
正态函数曲线的特点
wiki
Discover Topics
Scalene Triangles
Circle
Reflection
Fractions
Constructions