I play games that have grid maps and I would like to know how to enter these points on an excel spreed sheet and find the distince between the two points.

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I'm not sure if you can see this example of what i want to do. So if you have a grid box map with 500 boxes across and down and you want to know the distance between to two points how do I enter them on the spread sheet. If the top row is called "Y" and down is called "X" and my base was at y125, x325 and the base I want to go to is y325, x425. What is the distance between the two point and how do I enter the points?

Thanks,

Potatoebob