text: function cone(radius, height){
      
      let volume = (1 / 3) * Math.PI * radius * radius * height;
  
      let baseSurfaceArea = Math.PI * radius * radius;
      let slantHeight = Math.sqrt((radius * radius) + (height * height));
      let lateralSurfaceArea = Math.PI * radius * slantHeight;
      let surfaceArea = baseSurfaceArea + lateralSurfaceArea;
  
      console.log('volume = ' + volume);
      console.log('area = ' + surfaceArea);
      
  }
  
  cone(3.3, 7.8);