[GRASSLIST:9100] Area size of a vector layer..

[Luca Casagrande]

Hi guys!
I got a SHP surface vector layer and inside i got 4 categories of surfaces 
(each one splitted in smaller area spread on the map): I need to know the 
total cover extension for each category.
How can I?

P.S.
on the attributes table i haven't any information on surface extension.

Thx
Luca

-- 
gtalk: luca.casagrande at gmail.com
skype : thedoktor78
msn: doktoreas at hush.com
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