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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?

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

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Circles don't have 'lengths'. – nagytech Jul 13 '12 at 9:52
Do you mean a radius, diameter, or circumference of 500m? – Fezter Jul 13 '12 at 9:52
yes the radius is 500 meters – user8839 Jul 13 '12 at 10:02
up vote 3 down vote accepted

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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