Explore the conditions of the slopes for perpendicular lines. English version: http://www.geogebratube.org/material/show/id/3449 (Download GeoGebra file) Drag C so that the two lines are perpendicular to each other. What is the relationship between their slopes? 探討兩線垂直時的斜率關係。 中文版: http://www.geogebratube.org/material/show/id/15486 (Download GeoGebra file) 拖拉紅色
C 點，令兩線垂直。 |
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 >