Made small change to a code of yours that have seen on a blog

[UMineiro]

Hi,

This module is adapted from the one described on https://openhome.cc/eGossip/OpenSCAD/SectorArc.html

Just added an eccentricity parameter to draw ellipses too and set the fn parameter to the global $fn value by default

module sector(radius, angles, eccentricity = [ 1, 1], fn = $fn) {
r = radius / cos(180 / fn);
step = -360 / fn;

points = concat([[0, 0]],
    [for(a = [angles[0] : step : angles[1] - 360]) 
        [r * cos(a), r * sin(a)]
    ],
    [[r * cos(angles[1]), r * sin(angles[1])]]
);

scale ( eccentricity ) difference() {
    circle(radius, $fn = fn);
    polygon(points);
}

}

module arc(radius, angles, width = 1, eccentricity = [ 1, 1], fn = $fn) {
scale ( eccentricity ) difference() {
sector(radius + width, angles, fn);
sector(radius, angles, fn);
}
}