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5-s-01-能透過操作，理解三角形三內角和為180度
Author:
chuck.ncyu
GeoGebra
New Resources
画直线等分三角形的面积
【案例】圆柱体内放置一个大球六个小球
判斷球體
兩位數除以一位數（一）
【案例】2013年安徽高考15题
Discover Resources
梯形
parallelogram and squares
ggb-fs-a1
正四面體對邊向量垂直作圖證明
火箭
Discover Topics
Tangent Function
Terms
Area
Polynomial Functions
Incircle or Inscribed Circle