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I have a site and want to draw an indicative line in a 5km buffer around the centre of the site. So I want to draw a circle with a radius of 5km. I have a tool for drawing circles and ellipses and rectangles squares and spirals.

None of these let me state the centre point and the radius.

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Drop a point (x,y), buffer the point 5km. – Roy Jul 13 '12 at 16:47
possible duplicate of Conflicting measurement units with buffer ftools – Get Spatial Jul 13 '12 at 18:19
up vote 5 down vote accepted

Not to steal Roy's thunder, but make a point in layer and then buffer it into a new layer. (Roy, why not answer instead of comment?)

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Cheers. That is exactly what I wanted. Simple answer for a simple question. Panic had blinded me! – Ger Jul 16 '12 at 9:01
The workflow I have recently been using is to create the point in a Memory Layer, create the buffer into a shapefile saved in a temporary location, then copy and paste the polygon into the final layer. A bit long but works OK. – Willy Jul 27 '12 at 10:14

With mmqgis plugin you can convert your geometry type to centroids :

Plugins > mmqgis > modify > convert geometry type

And then just create buffers on shapes (through Vector > Geoprocessing tools) and precise the desired radius.

You got it

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