When I look up the specs of GeoJson I see that circles are supported:

http://geopriv.dreamhosters.com/geojson/geojson-spec.html#circleExample

When I try out the code in geojsonlint (http://geojsonlint.com/) however, it gives me an error.

Input:

{ 
"type": "Circle",
"coordinates": [4.884, 52.353],
"radius": 200
}

Gives: 

"Circle" is not a valid GeoJSON type.

I want to show different places of interests with a range of influence on a map by using d3. It needs GeoJson for input but it is true that circles are not supported with GeoJson?

maps d3.js leaflet geojson
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