The figure on the right shows the top left-hand corner of the
complete diagram. Note the symmetry which leads to the three
measurements of
. Thus the diagonal of the square can be divided into three portions of lengths:
, x and
respectively. The length of the diagonal
| = |
| ________
Ö102 + 102
|
= |
| ___
Ö200
|
= 10 Ö2
|
. So x = 10Ö2 - 1.
