a phone....
telegram
a letter if you want to go really old school
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Yes, the x-distance, y-distance, z-distance, or any combination of the three between any two points may be zero Not possible. If the distance between two points is zero then the points are the same.
yes, it is believed that the Romans used this method when extreme accuracy was necessary
They must be collinear.
A circleus.
If you mean: (-8, 4) and (5, 4) Then the distance between the points works out as 13