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.

types of angles (acute, obtuse, right-angle) perpendicular and parallel lines You can use a shape's properties to help identify and classify it. Polygons are named depending on the number of sides.

Crows in a lab were able to distinguish shapes that exhibited right angles, parallel lines, and symmetry, suggesting that, like humans, they have a special ability to perceive geometric regularity.