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Perpendicular lines

Author:Ng KC

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探究三角形的全等條件
【案例】2013年安徽高考15题
圓的切線方程
讀磅
直線的斜率

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圓環
perimeter
Equal arcs, equal angles, equal chords
均分除法（整數÷整數）的副本
函数作图工具的副本

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Circle
Special Points
Statistics
Conic Sections
Quadrilaterals

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