a more precise distance algorithm

[ravas]

On Monday, May 25, 2015 at 1:27:43 PM UTC-7, Gary Herron wrote: 
> This is a statement about floating point numeric calculations on a 
> computer,.  As such, it does apply to Python which uses the underlying 
> hardware for floating point calculations.
> 
> Validity is another matter.  Where did you find the quote?

Thank you.

You can find the quote in the 4th comment at the bottom of:
http://betterexplained.com/articles/surprising-uses-of-the-pythagorean-theorem/