calculate the surface area of 1 minute grids in a certain latitude.

Namba Takaya <[email protected]>
Newsgroups gmane.comp.gis.gmt.user
Message-ID <[email protected]> 
Dear Sir
I would like to calculate the surface area of 1 minute in certain latitudes.
For example, I have  several grids of 1 minute like
5 grids in latitude 65:00S  and longitude 5:00E5 grids in latitude 65:59S  and longitude 5:00E5 grids in latitude 65.58S and longitude 5:00E
Could you tell me how we can calculate the surface area of all the 15 grids?
regards,
takaya
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