a 48 sided circle has a correct perimeter (off course, as Dave said, it’s an equation no matter the side count). but even a 48 sided polygon would have a near perfect perimeter (0,07%)
and it has a good area, within 1/3 % of the actual area.
it’s a rounding error.
but if you want more, go 72 or even 96.
the difference between the correct area of a circle and a 96 sided polygon is a fraction of a hair :
the expected result is 3.14159265359
the 96-gon area is 3.14159265
I can’t even give you a % of deviation there, we’re talking a difference of 0,00000000359 m2.
that is 0.00359 mm2 or 3590µ2
Computers don’t like circles. but they can manage a 96-gon.
there have been many cases where I’ve needed an odd number of sides. making arches for example, with an off number of stones (due to the keystone)