In the communication process cycle, the essential components include the sender, the message, the channel, and feedback. Time is not a component of this cycle; it is a factor that influences the process but not a core element.
On the day of her examination, Riya sharpened her pencil from both ends as shown below. 
The diameter of the cylindrical and conical part of the pencil is 4.2 mm. If the height of each conical part is 2.8 mm and the length of the entire pencil is 105.6 mm, find the total surface area of the pencil.