I need to create a perfect circle with the bezier tool and not with the circle tool. The purpose of this is to later animate my svg with css.
When drawing a citcle in Inkscape then this will be its path :
To convert this path to Bezier lines just select the object, then choose Path > Object to Path:
We can now insert nodes, break paths or whatever there is we need to do (below example was obtained by inserting 3 nodes and deleting the path between two selected nodes):