How to delete Polygons farer than 20km from a point in a SpatialPolygonsDataFrame in R?

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My code is the following :

t<-as.data.frame(swf2@coords)
t
         V1       V2
1 0.7419071 47.91876
2 0.7492245 47.83500
3 0.7417791 47.91809
4 0.7328195


                      
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