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Key Stage 3 (Junior Secondary)‎ > ‎3.2 Measures, Shape & Space 度量、圖形與空間‎ > ‎Coordinates Geometry of Straight Lines 直線的坐標幾何‎ > ‎

垂直線的斜率(2)

http://www.geogebratube.org/material/show/id/13834 (Download GeoGebra file)

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