Step-by-step explanation:
a) barn area = 9 × 9 = 81 m^2
b) perimeter = 9 × 4 = 36m or
= 9+9+9+9 = 36m
The area and the perimeter of the square barn which has each side 9 meters long is 81 m² and 36 m.
Area of square is the square of its sides length. It can be given as,
[tex]A=a^2[/tex]
The perimeter of the square is the sum of all its sides. It is four times of the length of its side.
[tex]P=4a[/tex]
Here, (a) is the length of the side of the square.
Each side of a square barn is 9 meters long. Thus the area of the barn is,
[tex]A=9^2\\A=81\rm\; m^2[/tex]
The perimeter of the barn is,
[tex]P=4\times9\\P=36\rm\;m[/tex]
Hence, the area and the perimeter of the square barn which has each side 9 meters long is 81 m² and 36 m.
Learn more about the area of square here;
https://brainly.com/question/1658516
