Prof. Giray Okten

Wednesday, February 11, 2009

Week 1 - Problem 3

From her window Karla looks at the wall of a house. There she can see the silhouette of a rectangular flag flying in the wind. At five different moments she draws the silhouette. Which of the 5 pictures cannot be right unless the flag is torn?


  1. Hint from Dr. Okten: Why don't you take a sheet of paper and fold it to make these shapes?