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 ()
Technorati Tags: Silverlight, Bing Maps