What's the term for a circle's distance from the center to its edge?

Radius

In what movie does Robin Williams deliver the inspiring line 'O Captain! My Captain!'? Which strategic war game simulates the Cold War struggle specifically between the USA and USSR? In Latvia, what food is traditionally set aside during Christmas dinner to honor ancestral spirits? Which fruit is mainly used in guava juice? In Finnish tradition, children dress up as what mythical figures at Easter?