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 square meter, also called the meter squared, is the Standard International unit of area. The symbol for square meter is m 2. Less formally, square meter is sometimes abbreviated sq m. When calculating area, it is important to realize that area is proportional to the square of the linear dimension.