What are parallel and perpendicular lines? Discover the difference between parallel and perpendicular lines with a Bitesize Second Level Maths guide.

This KS2 maths article explains how parallel lines are always the same distance apart and never meet. A perpendicular line is at right angles to another line.

This guide breaks down the basics of horizontal and vertical lines with clear examples, practical applications, and simple diagrams so that remembering the difference becomes second nature.

Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x ...