I am pretty sure I have the right code, but it is not working so clearly that is not the case. Please help if you can, thank you.

Error Message: There was a problem with your syntax.

```
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
};
```

I am not sure what I am doing wrong with the method at the bottom.