<div id="surface"></div>
<script>
    var draw = kendo.drawing;
    var geom = kendo.geometry;

    var arcGeometry = new geom.Arc([100, 100], {
        radiusX: 35,
        radiusY: 25,
        startAngle: 0,
        endAngle: 180
    });
    var arc = new draw.Arc(arcGeometry);

    // Set fill color and opacity
    arc.fill("lightblue", 0.7);

    var surface = draw.Surface.create($("#surface"));
    surface.draw(arc);

    // Change fill after 2 seconds
    setTimeout(() => {
        arc.fill("pink", 0.5);
    }, 2000);
</script>