Pavi join four cubical open boxes of edge \(24 \ cm\) each to make a pot for planting saplings of greens in her garden area. The saplings are cylindrical in shape with diameter \(21 \ cm\) and height \(12 \ cm\).
Based on the above information, solve the following questions:
1. Curved surface area of a cylinder
2. If Pavi wants to paint the outer surface of the pot, then calculate the area she needs to paint?
3. If Pavi decorates the four walls of the pot with coloured square paper of side \(12 \ cm\) each, then how many pieces of papers would be required?
4. What is the surface area of each cylindrical sapling?