How to calculate the area of a polygon given its coordinates?
{"type":"MultiPolygon","coordinates": [[[[40.92344999,57.76796047], [40.92299938,57.76776019], [40.92268825,57.76796619], [40.92312813,57.76816647], [40.92312813,57.76816647], [40.92344999,57.76796047]]]]}
It uses the same method as in Area of a polygon but does the arithmetic for you. Polygon area calculator Area=1.551079549