An
old chestnut goes like this:
There are a few variations of this, but the most common today seems to work like this.
__---|
__--- | 3
__--- |
__--+---------+-----+
__--- | +-+---+ | 2
----------+---+-+---------+
5 2 1 5
Split the above (crude ASCII drawing, sorry) of a
13x5 right triangle into five pieces as shown. Then
rearrange the largest four as shown below:
__---|
__--- | 2
__---+---------+ ,__ 1
__--- | +-----+ `
__--- +---+ | 2
----------------+---------+
8 5
We've got the whole 13x5 right triangle again -- but we didn't use the little square? Where did the little square go?
Answer