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.
If someone gives us a square that has an area of 25 square cm, it is pretty easy to guess and check and figure out that the sides of the square are 5 cm. However, when the area of a square is 23 square cm, guessing and checking does not seem to lead to an exact answerâwe need to find the square root. The radical and the radicand make up the notation used for square roots.