Stage 30 · Analytic Geometry
30.3.4 Distance from a Point to a Line
30.3 Two Lines: Parallel, Perpendicular, Intersection, and Distance
Point 4 of 5
30.3.4 Distance from a Point to a Line
Core ideaDrop the shortest perpendicular from the point to the line, and its length is d=|Ax₀+By₀+C|/√(A²+B²).
Module goal. Study how lines relate to each other, judge their positions, find intersections, and compute distances, finishing the toolbox for lines.