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.
Since most people are not that familiar with square footage calculations, the diagrams below may help you. To find the square footage of any square or rectangular area, simply multiply the length times the width. For example, a border 50 feet long and 10 ft. wide is 500 sq. ft. in area (50x10=500). For a circle, the area is equal to Ï Â· r2, or Ï (3.14) times the radius of your circle, squared. If your circle is 20 ft. across, its radius is half of that or 10 ft. To get the square footage of the circle: 3.14 x 10ft.