None.
There is nothing in the question that requires the polygon to be regular and it is difficult to define a radius, in any meaningful way, for an irregular shape.
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They are both shapes and both have 4 sides.
There is no river between Rome and Carthage. The two cities are on opposite sides of the Mediterranean Sea.
The time of year, which puts us on opposite sides of the sun.
As they are on different sides of the Mediterranean Sea, it had to be boat.
three sides