You have to multiply the two dimensions to get the area. In this case the answer will be 36 square inches.
27.713 square inches.
4.5 square inches
root 12 = 3.4641016151377545870548926830117
A square with a perimeter of 40 inches has sides 10 inches long which will give it an area of 100 inches2
Each side would be 5" long, A = SideA x SideB 5 x 5 = 25
3 inches, because the square root of nine is three
Each side would be 3 inches long and there are 4 sides, so 12 inches.
A = s2 Area of the square = s times s
6 x 6 = 36 square inches
To find the area of a square, you multiple the length of the side by itself. So a square with sides 3 inches long has an area of 3 x 3 = 9 square inches. (Draw a diagram if you need convincing!)