Given a basic X & Y grid what is the formula to determine distance between two grid items?

I.E

First item is at grid 5, 6 second grid item is at 7, 8.

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- Feb 19th 2010, 01:22 PMMysteryGrid Distances
Given a basic X & Y grid what is the formula to determine distance between two grid items?

I.E

First item is at grid 5, 6 second grid item is at 7, 8. - Feb 19th 2010, 01:35 PMe^(i*pi)
- Feb 19th 2010, 02:29 PMPlato
- Feb 20th 2010, 11:53 AMshayan603
what kind of grid is it?