text: function area(r) {
      
      if (typeof r == "number") {
          let result = r ** 2 * Math.PI;
  
      console.log(result.toFixed(2));
      } else {
          console.log(`We can not calculate the circle area, because we receive a ${typeof r}.`)
      }
  }
  
  area(5)
  area("sdfa")