- Assertion (A): A well-lighted and ventilated kitchen is necessary for a comfortable cooking environment and to ensure safety. Good lighting and ventilation help to reduce the buildup of heat and moisture, which are essential in maintaining hygiene. Hence,
Assertion (A) is true.
- Reason (R): Windows and doors having a wire mesh help to keep insects and pests out while allowing ventilation. The idea that windows and doors should not have a wire mesh contradicts the need for proper ventilation and pest control in the kitchen.
Therefore, Reason (R) is false.
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.