How to check lat long in circle or not SQL server

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SQL-Server

SQL-Server-2008R2

i have query that reply with this that latitude and longitude are in Rectangle or not.please check below code and image file.

My question is how to get result of circle? mylat long in circle or out i have "lat":"25.38227896335241","lon":"68.3395897859009"},"radius":"141.4213562373095" in database

example : "i have latitude longitude of car i am checking latitude ,longitude are in circle or not if in circle result 'Car in Circle' if not 'Car out of Circle area' this logic perfect in my rectangle but i want circle result also"

What I have tried:

DECLARE @g geography,
@pIn geography,
@pOut geography


DECLARE @minY varchar(10);
DECLARE @maxY varchar(10);
DECLARE @minX varchar(10);
DECLARE @maxX varchar(10);
DECLARE @carlat varchar(10);
DECLARE @carlong varchar(10);
DECLARE @CarIdx int;
select
@minY = g.minlatitude , --N'29.7071393481341'
@maxY = g.minlongitude , --N'64.808349609375'
@minX = g.maxlatitude , --N'28.2463279710488'
@maxX = g.maxlongitude --N'63.292236328125'
from tblgeofencing as g where ShapeType = 'rectangle'
SET @g = geography::STPolyFromText('POLYGON((' + @minX + ' ' + @minY + ', ' +
@maxX + ' ' + @minY + ', ' +
@maxX + ' ' + @maxY + ', ' +
@minX + ' ' + @maxY + ', ' +
@minX + ' ' + @minY + '))', 4326);

select TOP 1 @CarIdx= idx, @carlat = f.lat, @carlong = f.long from checkgeofence as f order by idx desc
SET @pIn = geography::STPointFromText('POINT(' + @carlat +' ' + @carlong +' )',4326)
SET @pOut = geography::STPointFromText('POINT( 28.709860843942856 63.643798828125 )',4326)

SELECT Poly = @g,
pIn = @pIn,
pOut = @pOut
SELECT DistanceInMetersIn = @g.STDistance( @pIn ),
DistanceInMetersOut = @g.STDistance( @pOut ),
STIntersectsIn = @g.STIntersects( @pIn ),
STIntersectsOut = @g.STIntersects( @pOut )
SELECT STIntersectionIn = @g.STIntersection( @pIn ).ToString(),
STIntersectionOut = @g.STIntersection( @pOut ).ToString()
if( @g.STIntersects( @pIn ) >= 1)
update checkgeofence
set IsGeofence = 1
where idx = @CarIdx