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circles don't have any characteristic's.
None. A decimal (if that is what you were trying to spell) is a representation of a number: it is not a measure of area nor any other characteristic.
Variance is a characteristic parameter of a probability distribution: it is not a statistic. In any particular situation (with a few strange exceptions) it has only one value and therefore cannot have any bias.
They have the same form for any variables, but the numerical coefficients can be different.
Any geometric shape that has more than three sides.