Possibly duplicate of
Hi, I've got a GPS location of a place. Coordinates: 33°58'9"S 18°35'51"E but inside there is another GPS location: Coordinates: 33°58'12"S 18°35'51"E
I want to check that if the person is in any area in the first coordinates (33°58'9"S 18°35'51"E) it must be accepted else if outside then not accepted.