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面积平分线
Author:
赵林
GeoGebra
New Resources
四邊形的特性
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等的四邊形
球体的体积推导（优化版）
球體建築師
Discover Resources
test1(尋找北極星)
直線排列 3
斜線2
雙曲線1--焦點法
三角形的概念
Discover Topics
Derivative
Standard Deviation
Trigonometric Functions
Cuboid
Interest Calculation