In any concave polygon where the number of sides n is an even number, so n=4,6,8,10… and any point P inside this polygon is joined to the midpoints of the sides of the polygon, n quadrilaterals will be formed, and if we mark their surfaces with S1,S2,S3,S4,S5,S6,…,Sn-1,Sn (marked in a sense of rotation), then it is shown that the equation is true: S1+S3+S5+S7+….+Sn-1 = S2+S4+S6+S8+….+Sn
https://doi.org/10.5281/zenodo.17466294
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