Problem #100: Where does the square go?
Paste a sheet of graph paper on a piece of cardboard. Draw the square shown
in figure 1, then cut along the lines to make five pieces. When you rearrange
these same five pieces, in the manner shown in Figure 2, a hole will appear in
the center of the square!
The square in Figure 1 is made up of 49 smaller square. The square in Figure 2 has only 48 small squares. Which small square has vanished and where did it go?