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  • Thank you for explaining. When I set center of the sector in high latitude, the visualization of the geometry is stretched like part of a ellipse, I think that's the result of projection, does this stretching affects calculation of area? Commented Mar 2 at 14:32
  • You should not trust Cartesian area calculated in Web Mercator at any latitude, but especially at high latitude. Commented Mar 3 at 4:04