Hi,
in a database I have stored several addresses including their
geocoding data. Now I need to write a function where the user can set
a start point and a distance (radius) and the result should show every
address which is within this circle.

I need to do all the calculation server side and then sent the
relevant addresses to the client to finally ad the markers to the map.

By calling the Geocoder I get the lat/lng for the start point but
don't know how to do math for the circle. I would need to check every
address from the db whether it is in the area of the given circle or
not by looping.

Is this possible? Any help appreciated!

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