Perimeter and Area of a Square Sheet
The given square sheet has a side length of 10 2/5 cm. To find the perimeter and area of this square sheet, we will follow the steps below:

Finding the Perimeter:
- The formula to find the perimeter of a square is P = 4s, where s is the length of one side of the square.
- Given, the side length of the square sheet is 10 2/5 cm. To add the whole number and fraction, convert 10 to an improper fraction: 10 = 50/5. Therefore, the side length is 50/5 + 2/5 = 52/5 cm.
- Substitute the side length into the formula: P = 4 x 52/5 = 208/5 = 41.6 cm.
Therefore, the perimeter of the square sheet is 41.6 cm.

Finding the Area:
- The formula to find the area of a square is A = s^2, where s is the length of one side of the square.
- Given, the side length of the square sheet is 10 2/5 cm (52/5 cm).
- Substitute the side length into the formula: A = (52/5)^2 = 2704/25 = 108.16 cm^2.
Therefore, the area of the square sheet is 108.16 cm^2.