checking size of Polygon drawn with Leaflet l.draw.polyline -

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i've made website leaflet draw polygons on osm-map.

now want check size of polygon, because polygon must not exceed defined size, example, 5 square kilometers.

does have idea check size of drawn polygon?

i have used leaflet.draw ( https://github.com/leaflet/leaflet.draw ) draw polygon.

and has geodesicarea function. sample in 'draw:created'. 

    map.on('draw:created', function (e) {         var type = e.layertype,             layer = e.layer;             if (type === 'polygon')              {                 var area = l.geometryutil.geodesicarea(layer.getlatlngs())                 ...

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