Python 3.6.2 (default, Jul 20 2017, 08:43:29) 
[GCC 6.3.0 20170406] on linux
Type "copyright", "credits" or "license()" for more information.
>>> r=3
>>> area=3.14*r*r
>>> print(area)
28.259999999999998
>>> r=567
>>> area=3.14*r*r
>>> print(area)
1009475.4600000001
>>> quit()
