ctx.beginPath();
/* ctx.arc(x, y, radius, startAngle, endAngle[, counterclockwise] */
ctx.arc(20, 50, 10, 0, 2*Math.PI)
ctx.stroke();
// or ctx.fill();<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Draw a circle</title>
</head>
<body onload="draw();">
<canvas id="circle" width="150" height="150"></canvas>
</body>
</html>ellipse(x,y,x,y); //x and y represnt number value not stringnction draw()
{
var canvas = document.getElementById('circle');
if (canvas.getContext)
{
var ctx = canvas.getContext('2d');
var X = canvas.width / 2;
var Y = canvas.height / 2;
var R = 45;
ctx.beginPath();
ctx.arc(X, Y, R, 0, 2 * Math.PI, false);
ctx.lineWidth = 3;
ctx.strokeStyle = '#FF0000';
ctx.stroke();
}
}