Possible Duplicate:
Conflicting measurement units with buffer ftools

I have a shapefile as input. How could I create a circle with a radius of exactly 500 meters, using QGIS?

marked as duplicate by whuber Jul 13 '12 at 12:34

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If you need a polygon that is like a circle, you can select a point, then use Vector->Geoprocessing Tools->Buffer(s). Set the buffer distance to the desired radius.

Note that it will be a polygon when you save it to a shapefile. It'll look round at some scales though :-)

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