Stage 30 · Analytic Geometry
30.3.2 Perpendicular: Slopes Are Negative Reciprocals
30.3 Two Lines: Parallel, Perpendicular, Intersection, and Distance
Point 2 of 5
30.3.2 Perpendicular: Slopes Are Negative Reciprocals
Core ideaPin two lines into a right angle and as one climbs the other must drop to match, so k₁·k₂=−1.
Module goal. Study how lines relate to each other, judge their positions, find intersections, and compute distances, finishing the toolbox for lines.