How to make a circle type buffer around NetTopologySuite Point with radius in N meters?

Question

I have to draw a circle with N meters diameter around some geolocation.

I could able to generate coordinates for vertically oriented ellipse only.

C#

using NetTopologySuite;
//
const int SRID = 4326;
var fact = new GeometryFactory(new PrecisionModel(), SRID);
var point = fact.CreatePoint(new Coordinate(lat, long));
var bufferParameters = new BufferParameters();
var poly = point.Buffer(0.0005, bufferParameters) as NetTopologySuite.Geometries.Polygon;
    
var coords = new List<BasicGeoposition>();
foreach (var cItem in poly.Coordinates)
{
    coords.Add(new BasicGeoposition() { Latitude = cItem.X, Longitude = cItem.Y });
}

Please help me to understand how to set the radius and make circle instead of an ellipse.