Constants are defined within the scope of the current class and are made available to all child classes, unless theyre ove
Pi = 3.141592 class OtherPlanet Pi = 4.5 def OtherPlanet.circumference_of_circle(radius) radius * 2 * Pi end end puts OtherPlanet.circumference_of_circle(10) puts OtherPlanet::Pi puts Pi