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三角形性質--大角對大邊、小角對小邊
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GeoGebra
New Resources
正方形雪花图案
平行線的判定
活动三：应用性质
盈利與虧蝕
斐波那契螺旋弧线（表格法-可动态调节）
Discover Resources
Christmas Tree
串珠
正三角形堆垛
正三角形繞正方形旋轉
工具：PlaneString
Discover Topics
Straight Lines
Plane Figures or Shapes
Polynomial Functions
Scalene Triangles
Arithmetic Operations