It is FLAT. It continues in all directions even if it is broken by something physical. It does not have to be physical. To imagine a geometric plan put a ruler on a pencil and spin it.
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A coordinate proof
Geometric
The geometric mean of 8 is: 8.0
Geometric mean of 10 and 30 is 17.320508075688774. Look at link: "Calculation of the geometric mean of two numbers".
The geometric mean of 15 and 24 is 18.973665961