How to call these functions below? Owing to this code it shows me only [Function] [Function], but a purpose is to make it calculate. Thanks for tips.

```
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 Math.PI * 2 * this.radius
}
};
var calc = new Circle(10);
console.log(calc.area, calc.perimeter);
```