You can add circle areas to maps by making them out of a center coordinate and radius using CircleLayer and CircleMarkers.
CircleLayer
CircleMarker
Excessive use of circles may create performance issues.
CircleLayers and CircleMarkers support hit detection and interactivity.
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CircleLayer( circles: [ CircleMarker( point: LatLng(51.50739215592943, -0.127709825533512), radius: 10000, useRadiusInMeter: true, ), ], ),