Finding a coordinate in a circle

Question

I am doing a mashup using Google Maps under Grails where users can create geofences by selecting a point on the map and a radius. This get stored on my database and the appl

Answer 1

One possibility is to calculate the distance from the centerpoint and compare it to the radius.

Depending on you application you may be have to take into account that the world is a sphere and not 2Dimensional. To calcualte a distance on earth you can use this formula.