Giant square - Portuguese MO, Problem 3, 2009
Source:
August 29, 2010
combinatorics proposedcombinatorics
Problem Statement
Duarte wants to draw a square whose side's length is cm and which is divided in squares whose side's length is cm and whose sides are parallel to the original square's one, without taking the pencil out of the paper. Starting on one of the vertex of the giant square, what is the length of the shortest line that allows him to make this drawing?