Javascript Beginner question:

In the following JS code - why cant the `radius` be found? : 

```js
/* Constructor */

function createCircle(radiusVal, color){

    // returning an object
    return {
        radius:radiusVal,
        //In ES6, to simpilify syntax, the below code means color=color (param value).
        color,
        draw: function(){
            console.log('Area ::'+ Math.PI*radius*2);
            console.log ('Color ::'+ color);    
        }
    };

}

let cir1=createCircle(5,'yellow');
cir1.draw();
```

I get the error: 

```
Uncaught ReferenceError: radius is not defined
    at Object.draw (factories_or_consts.js:12)
    at factories_or_consts.js:20

```