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 of a square is solved using the formula 'A = SÂ²', where A is area, S is the length of a side. This formula can be rewritten as S = âA (the length of a side is the square root of the area). Therefore, the length of the side will be the square root of 400, which is 20.