So, you have 20+ fixed coordinates and you want to know the distance between each of those and some new coordinate?

If so, put your fixed coordinates in columns A and B starting on row 3, and use C1:D1 for your new coordinates. Then put this formula in D3:

=SQRT(($C$1-A3)^2 + ($D$1-B3)^2)

and copy it down to cover your 20+ fixed coordinates. It will give you the distances, then you can put a new set of coordinates in C1:D1, etc.

Hope this helps.

Pete