Snap path circle and intersection

Snap.plugin( function( Snap, Element, Paper, global ) {
        Paper.prototype.circlePath = function(cx,cy,r) {
        var p = "M" + cx + "," + cy;
        p += "m" + -r + ",0";
        p += "a" + r + "," + r + " 0 1,0 " + (r*2) +",0";
        p += "a" + r + "," + r + " 0 1,0 " + -(r*2) + ",0";
        return this.path(p, cx, cy );

                };
});

var s = Snap("#svgout");

var cp = s.circlePath(100,100,100).attr({ fill: "none", stroke: "red" });
var cp2 = s.circlePath(150,150,100).attr({ fill: "none", stroke: "blue" });
var cp3 = s.circlePath(100,100,100).attr({ fill: "none", stroke: "green" });
var intersects = Snap.path.intersection(cp,cp2);

var intersects2 = Snap.path.intersection(cp,cp3);

intersects.forEach( function( el ) {
        s.circle( el.x, el.y, 10 );
} );



   
        Edit/Run