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三角形的内角和
Author:
孙逸旻
旋转直线AC，观察三角形内角的变化，并求内角和
GeoGebra
New Resources
圓周公式的應用
漂亮的摇摆曲线
球体的体积推导（优化版）
祖冲之的期望：内棋与外棋
讀磅
Discover Resources
平行四邊形與菱形的分別
記錄最大值
地球20160328
立面化設計
duality of regular polyhedron
Discover Topics
Upper and Lower Sum or Riemann Sum
Multiplication
Median Value
Area
Addition