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 (SI) unit of area. The symbol for square meter is m2. 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.