Bing Maps: draw circle on map

Working with maps, ie Bing Maps, you may need to draw figures, pologones (rectangles, circles, ecc) on your map to show area boundaries.
The simples poligones you need are: squares, rectangles, circles.
Of course, the poligone you draw have to follow map’s zoom, and you don’t want to re-draw it every zoom action 😦

Last one, the circle, is intuitive when you need a short look to something in the nearby (10 km radius from Chris Pietschmannxyz).
Chris Pietschmann has a sample that clears your mind, for the simplest solution you’ve never thinked about: pushpins. 😉

In his post, Silverlight Bing Maps: Draw Circle Around a Latitude/Longitude Location, he shows you how to get the circle perimeter ()

source: Silverlight Bing Maps: Draw Circle Around a Latitude/Longitude Location

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