A polygon of one hundred sides, having an internal angle sum of 17640 degrees.
For a regular hectogon with sides of length x,

Area = x2795.3

From a distance, it doesn't look much different from a circle. For circle of equal perimeter (100x) to the hectogon above,

Area = ( 100x / 2 &pi)2 &pi =   x2795.7

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