Draw arc on HTML5 canvas

arc(x, y, radius, startAngle, endAngle, anticlockwise)

example:

function drawArc(context){

 context.strokeStyle = "#000000";
 context.lineWidth = 5;

 context.beginPath();
 context.arc(150, 200, 100, (Math.PI/180)*0, (Math.PI/180)*90, true);
 context.stroke();

 context.beginPath();
 context.arc(400, 200, 100, (Math.PI/180)*0, (Math.PI/180)*270, false);
 context.closePath();
 context.stroke();
 
}