[Qgis-user] Create circle with diameter in QGIS

[Christine]

Dear Madeline,
you may start with a point layer : the point(s) as the mid point(s) of your
circle(s).
Then you can draw a buffer of a certain distance with the buffer tool
(geoprocessing tools) around your point(s). In case of a buffer for points
the distance is the same as the radius of the circle you are searching for. 

Attention: the segments parameter controls the number of line segments to
use in oder to approximate a circle when creating rounded offsets. More
segments mean a closer approximation. Be aware that a shapefile cannot save
a true circle by nature but only an approximation to a circle with straight
segments. 

With the multi-ring buffer tool you might create more than one buffer at a
time around your point(s), so you could get as many rings (circles) around
your point(s) as you like. Certainly you have to determine the distance
between the circles you want to get. The output of the buffer tools have
automatically a polygon geometry. 

Regards, Christine



Madeline Krohn wrote
> I would like to create a circle whose diameter is 75 metres. I am using
> QGIS version 3.16.3-Hannover.
> My procedure so far has been like this:1. create a new shapefile layer ->
> geometry type: polygon2. in edit mode of this layer: add circle with
> centre and another point--> How can I change the radius/diameter of the
> circle afterwards or is there another possibility to create a circle with
> diameter directly?





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