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extent within given distance

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hi,
Is there any way to calculate the extent(geom) on basis of the given distance from a point, such as the point is in the middle. I have tried the Distance(geom,geom)<50, for calculating extent, but it is very slow in processing. My data SRID is 27700, and so the units are meters, i want to extract the geom in the specified meters.
 
any help will be appriciated.
thanks
 


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