Determine the output in the console (example 38)

It is necessary to predict what the following JavaScript code will output.

 const circle = {
    r: 10,
    getDiameter() {
        return this.r * 2;
    },
    getPerimeter: () => 2 * Math.PI * this.r
};

console.log(circle.getDiameter());
console.log(circle.getPerimeter());