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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- February 19th 2010, 02:22 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. - February 19th 2010, 02:35 PMe^(i*pi)
- February 19th 2010, 03:29 PMPlato
- February 20th 2010, 12:53 PMshayan603
what kind of grid is it?