const canvas = document.getElementById("canvas_one")
let ctx = canvas.getContext("2d")
ctx.arc(150, 75, 40, 0, 2 * Math.PI);
ctx.strokeStyle = "red";
ctx.fillStyle = "lightgreen";
ctx.lineWidth = 10;
ctx.stroke();
ctx.fill();
<canvas id="canvas_one"></canvas>
canvas {
background-color: lightgoldenrodyellow;
}
getContext('2d')arc(x, y, radius, startAngle, endAngle)
strokeStyle="color"
fillStyle="color"
linewidth="value"
stroke()
fill()