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 we know that the shaded area is a square, finding its area is a simple matter. Its area is s^2, or s squared, where s is the length of one edge of the square. To find the area of the circle, we use the fact that for any circle, its area is A = pi x r^2, or pi times r squared, where r is the radius of the circle.To find a circle's radius, measure from the circle's center to any point on the circumference of the circle. Multiply r by itself.Then multiply that result by pi.o do this, simply subtract the area of the circle from the area of the square. Your formula should look something like this: A (shaded) = A (square) - A (circle) = s^2 - (pi x r^2) Notice that it does contain the constant pi.