circumstances of a area in google map

[karthik_ppts]

Hi Frendz,
I have a latitude and longitude points of particular place namely X. Now I want to check the given latitude and longitude point of a place namely Y is within a circumstance of a particular radius from that point X. How to check that? i'm using google map.

[vibhaJ]

1. count distance between x and y point.
2. check wheather it is less than radious (y is inside)
it is greater than radious (y is outside)

[karthik_ppts]

1. count distance between x and y point.
2. check wheather it is less than radious (y is inside)
it is greater than radious (y is outside)

Thanks for your reply. I'll try and inform about the result

[karthik_ppts]

Yes.. Its soved using the following code

$lat1=mysql_result($rs_area,0,"lat");
			$lon1=mysql_result($rs_area,0,"lng");
			$distance=mysql_result($rs_area,0,"radius");
		
			$lat2=$row['latitude'];
			$lon2=$row['longitude'];
			$R = 6371; // Radius of the earth in km
			$dLat = deg2rad($lat2-$lat1);  // Javascript functions in radians
			$dLon = deg2rad($lon2-$lon1); 
			$a = sin($dLat/2) * sin($dLat/2) +
					cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * 
					sin($dLon/2) * sin($dLon/2); 
			$c = 2 * atan2(sqrt($a), sqrt(1-$a)); 
			$d = $R * $c; // Distance in km