The r read-only property of the SVGCircleElement interface reflects the r attribute of a <circle> element and by that defines the radius of the circle.
If unspecified, the effect is as if the value is set to 0.
An SVGAnimatedLength representing the radius of the circle.
<svg
xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 100 100"
width="200"
height="200">
<circle r="50" fill="gold" id="circle" />
</svg>const circle = document.getElementById("circle");
console.log(circle.r);