Dividing a Square


Problem

Figure A is a square whose side is 8. We cut the square into four pieces and arranged them as in figure B.

The area of the square A is 64, but the area of the rectangle B is 65.

What is wrong?


Applet

Press ">" button to move one piece.
After one piece has moved into the rectangle B, press ">" button again.

Press "|<<" button to initialize the figure.