In the below, how do i find the perimeter of a circle with radius 5

```
function Circle (radius) {
this.radius = radius;
this.area = function () {
return Math.PI * this.radius * this.radius;
};
// define a perimeter method here
this.perimeter = function(){
return 2* Math.PI * this.radius
}
console.log(Circle.perimeter(5));<--- <<<is anything wrong with this line?>>>
};
```