Non-verbal communication is the process of conveying messages without using spoken words. It involves gestures, facial expressions, eye contact, body language, and tone of voice to express thoughts or emotions. It is crucial for understanding the feelings and attitudes of individuals during interactions.
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.