[R] Draw a circle with a given radius in an existing map

Xiaomei Ma xiaomei.ma at yale.edu
Tue Nov 7 06:11:27 CET 2006

I have drawn a map in which the X and Y axes are latitude and 
longitude. Now I need to draw one circle on the map - the center is a 
point with specific latitude and longitude, but the challenge is that 
the radius is in miles. Is there a way to do this? I'd very much 
appreciate your response.


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