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Author:
吕玉雷
GeoGebra
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平行線的判定
斐波那契螺旋弧线（表格法）
折扣
活动三：应用性质
第八周作业2
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反正切函數
Angle Sum in a Triangle
Angle at centre twice angle at circumference
等腰三角形 － 等角對等邊的副本
虎牙直播
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Rectangle
Similar Triangles
LCM and GCD
Fractal Geometry
Tangent Function