https://www.codecademy.com/en/courses/spencer-sandbox/5/4?curriculum_id=506324b3a7dffd00020bf661

```
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;
};
};
```

Completing the exercise was fine but I have been trying to print either the perimeter or the area but I am unsure how to do this. I know the radius needs to be defined and I have tried different things but all I get is either error messages or not what I want to happen. Any help would be great.