Learn how to find equations of parallel lines, work out the gradient of perpendicular lines, and prove that given lines are parallel or perpendicular.

The formula for the perfect parking job was recently worked out by mathematician Simon Blackburn, professor at the University of London.

The formula for the perfect parking job was recently worked out by mathematician Simon Blackburn, professor at the University of London. Stanford mathematics professor Keith Devlin tells NPR's Audie ...

The formula for the perfect parking job was recently worked out by mathematician Simon Blackburn, professor at the University of London.

The formula for the perfect parking job was recently worked out by mathematician Simon Blackburn, professor at the University of London.