There is the GetLatitudeLongitudeSize method in the RadMap that calculates degree size an object according to its location and size.
You can use the following sample method that creates the MapEllipse by center and size using this functionality:
MapEllipse CreateMapEllipseByCenter(Location center,
MapEllipse ellipse =
ellipse.Width = width;
ellipse.Height = height;
Size degreeSize = radMap.GetLatitudeLongitudeSize(center, width, height);
Location location =
Location(center.Latitude + degreeSize.Height / 2d,
center.Longitude - degreeSize.Width / 2d);
All the best,
the Telerik team
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