So my current error raises this: I dont understand, because perimeter should be defined. I am not understanding the error that my code is raising.

Your code caused a TypeError when trying to call .perimeter(). Make sure

you have properly defined the perimeter method. Use the .area() method

as a guide. Here's the error message: TypeError: c.perimeter is not a

function

```
function Perimeter (radius) {
this.radius = radius;
this.perimeter = function(){
return Math.PI * this.radius * 2;
};
}
```