1. (i) Personal Hygiene of a Chef:
1. Wash Hands Regularly: The chef should wash their hands with soap and water before preparing food, after handling raw ingredients, and after using the restroom.
2. Wear Clean Clothing and Apron: The chef should wear clean clothes and an apron to avoid contamination from clothes and hair.
2. (ii) Hygiene During Food Storage in a Fridge:
1. Store Food in Airtight Containers: Storing food in airtight containers helps prevent cross-contamination and keeps food fresh longer.
2. Maintain Proper Temperature: The fridge should be set at the correct temperature (around 4°C or 40°F) to slow down bacterial growth.
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.