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The area of the decagram is not correct. Actually it is taken from and this is not the area which is given here, but the so-called weighted area (the definition is given - some regions are counted multiple times). It is easy to see that the given area is not correct because it is higher than pi*R² where R is the circumradius.

you're wrong H A M 1 (talk) 18:20, 31 January 2023 (UTC)