13/5000 The calculation results are different from ArcGIS

[Godnx]

    I used the method: Voronoi_regions_from_coords to form Voronoi polygons in geographical regions, and then calculated the area of each Voronoi polygon, but the result was different from ArcGIS calculation。My code is as follows：

polys, pts = voronoi_regions_from_coords(v_coords, boundary_shape)
boundary_area = Decimal(boundary_shape.area)

for index,key in enumerate(polys):
    area = Decimal(polys[key].area)
    weigt = area / boundary_area


 Looking forward to your reply！