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20190530 與平行線有關的角
Author:
Hui Sir
GeoGebra
New Resources
垂直線的斜率
双心四边形
多邊形的面積
球体的体积推导（优化版）
球体的体积推导
Discover Resources
Measurement & Classification of Angles 角的量度和分類
拋物線與直線的交點
利用对称求线段和最值
資料統計
拼出三角形的副本
Discover Topics
Expected Value
Standard Deviation
Frequency Distribution
Inequalities
Arithmetic