Figured it out like this:
SpatialReference defaultGeoSys = new SpatialReference("");
defaultGeoSys.SetWellKnownGeogCS("EPSG:4326");
//define a circle using point and buffer
string pointlineString = "POINT (" + longitude + " " + latitude
+ ")";
Geometry center = OGR.Ogr.CreateGeometryFromWkt(ref
pointlineString, defaultGeoSys);
Geometry bufferDefn = center.Buffer(radiusInMiles, 10000);
Geometry bufferDefnPolygon = bufferDefn.GetGeometryRef(0);
Geometry actualCircle = Ogr.ForceToPolygon(bufferDefnPolygon);
The actualCircle serves my purpose of within and intersects. This is just a
fyi if someone else has an issue like this.
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