The angles on a straight line always add up to 180°, so the purple angle next to it must be 100°. Image caption, STEP 4: Work out the size of the remaining angles.

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.

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.

Delta Air Lines debuts crazy ‘parallel reality’ airport experience based on Seattle startup’s technology by Taylor Soper on January 10, 2020 at 5:58 am January 10, 2020 at 10:12 am Share 292 ...