1. The problem statement, all variables and given/known data An ant which can crawl along the walls of a cubical box of side 1 m can travel from one edge to the diagonally opposite edge by travelling what shortest distance? The options are : a) 2m b)√2 +1 m c) √3 m d) √5 2. Relevant equations 3. The attempt at a solution I drew a diagram and the shortest distance is the diagonal of the cube √3 m .But the ant can't fly so I thought the next option is for it to crawl diagonally on one of the faces and then through 1 edge to reach the diagonally opposite point. That would make my answer √2 +1 m . But the right answer is √5 m. Where have I gone wrong? Please help.