Hi,
There are a number of plugin that can make circles. ArcheoCad, is one of
them. If is does not work the way you want, look for an other under CAD
like plugins. You can also create a 50k buffer around points.
Once you have the circle, save the layer and right click on the circle, and you
will get the area. If you want, you can create a field called 'area' in
the layer with circles and you can generate the area using the Qgis field
calculator using and expression.
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
Le 2015-01-03 17:50, "Paula Urbina [via OSGeo.org]"
<[email protected]> a écrit :
Could you please tell me, How I can assign a circle radius (X=50 km) to
a location? And then How I can calculated the area covered by some circles?
Please, help me!!!!
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