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GeoGebra
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外面有圓
Author:
施重宇
GeoGebra
New Resources
三角函数 的副本
常见四边形是否是双心四边形
圓的切線方程
球体的体积推导（优化版）
探究三角形的全等條件
Discover Resources
五星形的頂角
專題
Angle between Two Planes 面面角
Locus: Fixed Distance From Straight Line
Text sequence
Discover Topics
Step Functions
Congruence
Tree Diagrams
Percentages
Exponent