arcTo

arcTo(x1, y1, x2, y2, radius)

example:

function drawArc(context){

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

 context.moveTo(50,50);
 context.lineTo(50,200);
 context.arcTo(300,200,300, 50, 150);
 context.stroke();

  
}