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Custom Object Help

I am trying to learn how to write a custome object. Create a circle with properties and methods. What is wrong with my code? I am getting the first prompt box, but not the alert box showing the diameter. Thanks!

function createObject(){
var radius=prompt(‘Enter the radius:’,””);
var myCircle = new Circle(radius);
myCircle.diamter;

function Circle(radius){

myRadius=radius + 0;

function diameter(){
var diameter=this.myRadius*2;
alert(diameter); }

}
}

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