Aprial 12th Thursday (四月 十二日 木曜日)

Babylon!  I seems to come back the ancient Babylon when reading the Mathematic Throught from Ancient to Modern. Those ancient people in Babylon used cuneiform to represent digists.  The "cuneus" came from Latin.

  From Babayon civilization, the knowldege on arithmetic seems to be enough, but geomerty did not seem to be
important.  However, there are some evidences to prove those ancestors know the Pythagoras law.  They can work out the approximate area of a circle using A=c*c / 12 (the "c" is the perimeter).