There are a variety of modern definitions of economics, some reflect evolving views of the subject or different views among economists.
So the area of the square is 7 x7 = 49 cm^2 and the perimeter of the square is 7 x 4 = 28 cm. And in example 1 you have a square of side length 8cm and you need to work out the area and perimeter of the square. So the area of the square is 8 x8 = 64 cm^2 and the perimeter of the square is 8 x 4 = 32 cm.
The area is always expressed in square units. The standard units that are generally used for measuring area are square centimeter and square meter. The area of a square with side 1 cm each is 1 cm Ã 1 cm = 1 square centimeter. In short, it is expressed as cm^2 or sq. cm.