How to draw circles

Hi everyone,
Is there a way I can plot a circle giving a center position and the radius?
I couldn’t find any filter to properly do it

Try the Ellipse source from the Sources menu. A Ratio of 1 (default) gives a circle.

Solved it, thanks!

Calculating as R = (x^2+y^2)^0.5, then contour it may be an alternative method