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.
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1I wish to note that Bézier curves cannot represent a perfect circle (they can do pretty good approximations though). – Wrzlprmft♦ Oct 15 '15 at 13:43
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@Wrzlprmft Why not? – Scribblemacher Oct 15 '15 at 14:35
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1@Scribblemacher: Bézier curves are polynomial curves and a circle isn’t. It all boils down to the sine function not being a polynome. (A rough analogy is that you cannot represent π as a fraction.) – Wrzlprmft♦ Oct 15 '15 at 14:41
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1@Scribblemacher Trigonometric functions are part of a group called trancendental functions which can not be described by polynomials. The accuracy is described well in pomax.github.io/bezierinfo anyway you could use rational splines (Beziers or b-splines which are called NURBS) to make accurate circle arcs (altough they arent paramerized as circles are) – joojaa Oct 15 '15 at 19:23
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When drawing a citcle in Inkscape then this will be its path 
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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):
Select the
ellipse tool, draw a circle (with Ctrl) and now - with theellipse toolstill selected - hover over the 3 visible nodes of the circle and read the hints in the status line: you can position the start and end point of the circle to create a segment, and with the toggle on the ellipse controls bar you can determine if it's a segment (closed, filled path including the center) or an arc (unclosed shape).
Taken from This Post on the Inkscape forums.
