startAngle: Number

Sets the starting Angle of the Pie or Doughnut Chart in degrees.

• Angle is in degrees.
• Angle increases in clockwise direction
• Angle can be positive or negative value

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
  data: [{
   type: "pie",
   startAngle:  90,

  },
 ]
 .
 .
});
chart.render();