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 regular heptagon inscribed in a circle of radius R is 7 R 2 2 sin â¡ 2 Ï 7 , {\displaystyle {\tfrac {7R^{2}}{2}}\sin {\tfrac {2\pi }{7}},} while the area of the circle itself is Ï R 2 ; {\displaystyle \pi R^{2};} thus the regular heptagon fills approximately 0.8710 of its circumscribed circle.