Perpendicular Lines - Geometry: Constructions

Parallel lines never intersect each other They are non-intersecting lines Perpendicular lines are two intersecting lines They intersect each other at right

These slope values are not the same, so the lines are not parallel The slope values are also not negative reciprocals, so the lines are not perpendicular Then

perpendicular At right angles to one another Can be of two lines, two planes, a line and a plane, or a line and a surface From: perpendicular in The Concise Oxford

perpendicular Two lines are perpendicular if and only if the product of their slopes is -1 If the slopes of two lines which are perpendicular are m1